posting from gentoo 1.4 beta now
not ready to go with rc1 because this is a p2 400 so it goes a little slow with the configuration
emerge - the easiest installation of nvidia in linux I've seen (only grief with suse 8.0)
you can search the portage tree with
emerge -s fluxbox (for example)
and that will show you what versions are there
emerge -p fluxbox will show you what you're about to put on your system
get to know the "USE" flags system and you'll really be able to optimize it
I think you'll get more out of gentoo than I have as I'm still a real n00b, but for me, this has been the fastest linux system I've installed
enjoy