>Is there a version of Firefox 3--or, i guess, Iceweasel 3--in package form yet, or is it still in some kind of testing form where you have to compile it yourself?
It is only in Sid right now: http://packages.debian.org/search?keywords=iceweasel Of course there is nothing stopping you from installing firefox3 manually, but if you want Iceweasle deb packages, you will have to pull from Sid. Have fun!