I'm completely reinstalled with x86_64 Fedora 7 now, and I went through my checklist of everything I did in F6, and it looks like I've got it all working the same way under F7. Scanner works, built lirc driver OK, built truecrypt driver OK, I can play DVDs with mplayer and get the digital audio sent to my receiver. Just can't find anything busted. There were one or two packages I had to download which were previously on the DVD, but that was no big deal once I noticed something missing (kdegames being the most important :-). The only annoying problem I ran into was: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=242279 It may be a yumex only problem. When I install 32 bit f7, I'll stick to just yum rather than fancy gui and see if I get all the dependencies.
