[mavrommatis]

Nice. This page http://stackoverflow.com/questions/252986/is-there-an-auto-u... lists a few alternatives, including WinSparkle http://winsparkle.org/

I like that Sparkle's open source, and it's being used by many open source apps on Mac already. Getting the auto-update software to actually be secure is not trivial either (a recent attack was discovered on Acrobat's updater for example).