Adobe update manager is really annoying, but most instructions on the web to disable it merely tells Adobe Updater not to report updates; the updater still runs silently. The fact that I'm dedicating system resource every now and then so the Adobe Updater can phone home but not tell me to update is not good enough for me. I want Adobe Updater to stop completely.

Apple also releases system updates that keep your Mac secure and stable. When a new major version of OS X is released, you can download the upgrade for free from the App Store. If you're using an older version of OS X, updates are handled through the Software Update utility.

To stop Adobe Updater completely, one must understand how it gets run in the first place. The updater is launched by a Mac OS X system service called launchd. To launchd, Adobe Updater is a periodic job. The job file is stored under your ~/Library/LaunchAgents folder. The actual file name is suffixed with a number of random characters, but it starts with 'com.adobe.ARM' as the prefix. If you look inside the file (it's a plain text file), you'd see that launchd would run the updater at 12600 seconds interval, or 3.5 hours.
To remove, type these commands in a Terminal window:
Basically, the idea is, for each launchd plist file in ~/Library/LaunchAgents that you don't want, run launchctl remove on the job name, which is the same as the plist file name without the .plist suffix, then remove the actual .plist file.
While you are at it, there may be other launchd jobs in ~/Library/LaunchAgents left over from stale applications you might have tried before. Feel free to remove them all.
You're welcome.
Edit (Oct 20, 2012): a couple of readers pointed out in the comment that the launchd namespace used by Adobe Updater is now different. I just installed Adobe (Acrobat) Reader XI and found that the name is still com.adobe.ARM.*, but if you have Creative Suite, it might be com.adobe.AAM.* instead. I don't have Creative Suite so I can't verify that.
Furthermore, it appears that when you set Updater preference in Adobe Reader XI to 'Do not download or install updates automatically,' it now removes the launchd task as well, which means the launchctl and rm commands would no longer be necessary. Kudos to Adobe for figuring that out!
One reader also pointed out that in his case, the updater is installed in the system-wide location /Library/LaunchAgents. In that case, you will need to run “sudo su -” first and type in your own password to gain root privilege (the prompt changes from “$” to “#”) before they can be removed. Be careful the commands you enter as root, as a mistake can irreparably damage your system.
Thanks for keeping me updated y'all.

Since 2014’s “Prototyping: Fake It Till You Make It” WWDC session, Apple’s Keynote app has become a popular tool for designers and developers looking to make quick and easy app prototypes and concepts. Alongside the rise of Keynote, several other dedicated prototyping tools have grown in popularity as user experience design gains traction as an essential part of the app development and design process. One of those tools is Adobe XD, formally launched as part of Creative Cloud during 2017’s Adobe MAX conference and updated yesterday with voice prototyping.

Now that the application has had a year to mature and grow a more robust feature set, I asked Adobe how Keynote users looking to explore in-depth prototyping can easily make the jump to a more powerful tool.

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Keynote wasn’t built for prototyping and predates iOS app development by several years. While basic concepts are possible, users will quickly encounter the app’s limits. Cisco Guzman, Group Product Manager for Adobe XD, tells me that when you hit the app’s functional ceiling, it’s time to look for a more robust solution. “Keynote was developed to be a presentation tool, and it’s an amazing presentation tool. But there are things that you become acutely aware of when you’re using it or any other product, where you say, ‘Hmm, this isn’t really the strike zone anymore.’”

No matter what tool you choose, the goal of prototyping is the same: communicating the essential concept of your app. “Pick a story that you’re trying to tell,” says Guzman. “Then pull XD out and start using it. It’s the first tool I can think of that ships to allow you to move in and out of the design thinking process.”

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Mark Webster, Director of Product at Adobe, echoes the sentiment, noting that both Keynote and XD’s workflows begin in the same place. “Tactically, whatever your starting point would be for prototyping in Keynote – you’re getting assets from somewhere. Maybe you have a UI kit of a bunch of off-the-shelf components. You can start the same with XD. If you know how to use Keynote, you’ll pick up XD immediately. You’ll start to discover this vision of context awareness, of showing you the right tools at the right time.”

“Develop [the prototype] to a certain level of fidelity, expose it, get it out there, come back in, iterate some more, put it out there again. I feel like that round trip of storytelling is an easy way to understand every part of the system,” Guzman added.

Prototyping in Keynote for iOS.

While Keynote is available on both macOS and iOS, Adobe XD is built primarily for macOS and Windows. Prototypes can be viewed on an iPhone using a companion application, but creation happens on the desktop. This makes Keynote compelling for designers who prefer creation on iOS. Apple has even started to offer Today at Apple sessions built specifically around learning how to prototype on an iPad.

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Guzman argues that we shouldn’t assume content creation must always be the primary workflow on mobile devices. “I think it’s really applicable to think of how a stylus with a flat surface really unleashes so much illustration potential, photo retouching potential. A UX designer needs and uses different controls. Maybe it starts with really prioritizing content editing verses starting from scratch.” Webster adds that XD is still in its infancy, and the product will continue iterating to include new ways of working. “A lot of those [mobile first] workflows have products that have been around for a long time. XD is one of the newest of Creative Cloud tools.”

Software differences aside, no tool is “wrong” for the job if it lets you communicate your work. Whether it’s Keynote or Adobe XD, Guzman trusts the judgement of creators. “One thing that I think designers are infamous for is being resourceful. We use whatever it is we have to get where we need to go. I think that we know and understand the limitations of our own toolset.”

Update: Adobe has provided more information on the submission and review process for XD’s new plugin system:

Plugins need to be registered through our Adobe I/O console. This is also where developers will submit plugins to be distributed through the in-app plugin manager.

We expect developers to test their plugins for functionality and quality, but any plugins submitted to us for distribution through our plugin manager are also reviewed by our integrations review team to ensure plugins comply with the guidelines mentioned above. They will manually review each plugin before it is approved to be distributed through our plugin manger. This review team will make sure the plugin functions appropriately (doesn’t have major bugs, doesn’t degrade the performance of the application, loads in a timely manner, etc.), doesn’t contain inappropriate content and complies with our legal, branding and marketing policies.

Plugins will not be permitted to go through our distribution mechanisms if they violate our policies or guidelines. All developers that use our APIs and SDKs must agree to our developer terms.

More of 9to5Mac’s Adobe MAX coverage: