Free used parts, what's my best scenario

I have a crap load of used pc's I came into I want some insight on what my best case scenario would be for it. socket 939 mobos, socket 478 mobos, pentium 4 ht's, hard drives and plenty of memory. I can go get a grafix card PCI-e no issue. I am an eperiencedn overclocker so any cpu limitations I can handle. what should I use If I want a little something to take me into next summer for a few games and video/audio editing thanx. (no I will not send you any parts no matter what)

939 socket out of those 3 mention for sure. It's hard to say what else you should grab considering you haven't really mentioned anything else.

939 socket is still 'decent', at least for gaming.

Best case scenario... you find a 939 socket mobo with a 4400+ CPU or greater still on it. A case with a PSU that won't go out and take your parts with it. 2GB of ram (4x512MB DDR-400). A little hard drive or 10. And the graphics card you'll want (if you are purchasing) is like a 4850. Anything higher will probably be bottlenecked by the CPU.

I've seen 98oogt's on pentium 4's not bottlenecked by much so how would that be

I know in some games, L4D being one of them, a 4670 and 4850 get almost identical fps when paired with an Athlon X2 5000. Even that game become cpu limited on an old Athlon X2.