Depends what RAM,HSF and motherboard you got too...
If ya got some normal DDR PC3200 I would suggest putting the RAM on a divider.
For example instead 200mhz (400 DDR) I would lower that to 176mhz (333 DDR).
Then up the FSB of the CPU.
For example to 210, then if thats ok 220 and so on.
So the end result might be something like 230x10 = 2300mhz or higher...
(when OCing you might require to increase the voltage of the CPU)
This is just one way to OC your machine with ease.