I think it'd be a great idea to alphabetize the USE flags, and clean them up. I just got done alphabetizing mine manually, and not only are there duplicates, there are conflicts. I found one flag that was on twice and off once (or was that the other way around?). Very confusing for more advanced users who want/need to tweak their systems!
Also (and this is probably more of a Gentoo issue), it would be awesome if similar flags could be condensed. Like "ogg" "vorbis" and "theora"? We could condense those 3 down to 2 or even 1 I think. Today I found "stream" and "streams". I'm not sure, but those sound identical to me...
