I know about one: PVK: Pirates Vikings and Knights (It sounds shitty but it's really fun) They are testing, balancing and stuff in half life and they are going to build PVK2 for HL2.
I said "i will for sure", what i really meant was that i will test hl source, if it looks cool, i'll probably play it half way through till i can't wait no longer for HL2.
I kinda agree with your post, not that HL2 won't be as good as we all thinks, but that the FPS genre is dying.
I've played a few games, but no games have made me addicted like half life.
FarCry,Painkiller,Halo,UT2004 and all those don't have that original and fresh storyline like half life...