Well, since this is a sticky, I thought I'd post this here, though it's probably old news. Since the Motorola Droid A855 has been released, the developers have been working very hard to make more and more of them compatible with Eclair/Android 2.0.
My favorite thing to do (especially after having 'barcode scanner' installed) is to go to http://www.androlib.com
and research the apps I might want, then scan the QR code and install said app. If it has any 'hiccup' at all, I just un-install it.