Not often, for sure. Still, every now and then you get a talented team doing the business. Personally I'm looking forward to "The Dark Mod" for Doom 3. I expect I'll buy a copy of D3 when that's finished.
I hope it does get finished. Big fan of the Thief series... ok, so Thief 1 & 2... 3 is just a bit 'lacking'.
F.E.A.R really got to me because of the single viewpoint approach. It *really* brings you into the game when you are more than a floating weapon and arms. First time I've seen it done well. Its something I've toyed with in Quake3, UT200X, SoF2 and DOOM3. I figured it was a must have for any future game/mod, though it is still rarely used. Gonna try it with Quake4 now - see about setting up a Strogg DM mod (play as Berserker, Gladiator etc, from their viewpoint).
Unfortunately, I don't see F.E.A.R being anything more then a great single player game. Its multiplayer doesn't grab me or anyone else I've shown it too. With any luck a mod will come out to prove me wrong. One can only hope
As for Action Quake4 - aint gonna happen, though there is the idea of using an open sourced engine for "Action" like game (check out the Action forums).
GROUND BRANCHMature Classic Tactical First Person Shooter