The update checker and updater features are pretty snazzy in wordpress. I can't say I've seen them reproduced as well elsewhere.
I've been racking my brain trying to figure out how the basics of it are done, but it escapes me.
I've tried looking at the source code and codex, but without a complete understanding of everything in the code base, I'm completely lost. Can anyone explain how it's done or point out some good references?