Since many people new to the Macintel scene aren't sure where to find unibins (universal binaries), I thought I'd start this thread for you to tell us where you've found yours. Here are the two biggest lists I know:

Apple's Universal List
MacUpdate's List

If you know of more sites like this, add them to the list!

I use VersionTracker to find Mac Apps

I don't remember VT giving out information saying something is universal, though. Usually I have to go into the description for that.

http://www.versiontracker.com/macintel/

MacRumors has got one: http://guides.macrumors.com/List_of_Universal_Binaries