MacroQuest64

http://www.memtest.org/

This is the one that TheRamGuy has in his signature on the Corsair boards, you do boot to it, and it is very thorough.

Thanks. I'll do try that one next.

I ran Prime95 for 11 hours, and got 0 errors/warnings.

i dont know what your setup is like, but i had one of the 2 sound cards in my machine go out that was crashing eq. you have pulled all extra hardware out just to make sure?

Seems unlikely. No problems in any newer games/older games/any other games, applications, programs, ect.

As said previosly, has to be a pretty long session, where I end up zoning probably over 20-30 times, before I get a CTD. I still need to run another RAM/CPU test.
I'll take your advice though, and see if running onBoard sound rather than my PCI sound card changes anything.

If you create a crash dump, zip it up (along with the pdb files from your build), and send it to me, I can give you more details on the crash...