How Far Can i push my comp?

Well, recently just started to overclock and here is what i have done.

Athlon 64 3000+ w/ MSI K8N Neo mobo
512 DDR500
FSB: 240
Cpu voltage: 1.65
Timings: Tcl - 2.5
tRCD- 3
tRAS - 11
tRP - 3

This is all i know how to play with now... anything else i can use to oc my comp...??

Are you maxed out on FSB speed?

windows xp wont fully boot if i set the fsb any higher. Also the mobo claims the cpu will be unstable if the voltage is pushed any higher... should i set the voltage higher?? and then go for higher fsb?