I have created an app, and in this app i created a pretty good updater, that can check out code.google.com for an update. I want to know if programmers would use this if i took it out of my app and gave out a slight modified source code?
Competition is good, although the individual(s) behind Sparkle did an excellent job making it easy to integrate and have a consistent experience with other Sparkle-enabled apps. Easy to the point where it took me a whole 15 minutes to make an app upgradable via Sparkle, and that included setting up the RSS feed and uploading a test update.
There's nothing wrong with alternatives, so I say yes.
I'd highlight the differences between it and Sparkle because, for anyone choosing any updater right now, the question would be why not Sparkle?
Also, if it demonstrates the use of certain Cocoa classes or certain techniques, you could briefly list those. Other programmers might find it useful as sample code.