more ram, faster cpu. what are ur parts? eg: what mobo do u have, what cpu slot type do u have, how many ram slots you have & how much memory they can take max, etc...
it's going to be a bit hard to find anything much faster since the socket that p2 xeon processor uses is rather old... and your probably using SDRAM... I would say that is about as fast as it gets for that old rig...
Yep, I would do a new build. But you can get a fairly nice system for around 550 bucks (if you can reuse your old cd rom, etc). I just ordered parts for a nice new e6400 rig, 2GB RAM, 7600GT vid card, etc for about 550.