Well.. the way to go about it is to loosen timings on your RAM and then crank up the FSB on your CPU, your RAM will follow unless you locked em down, keep going untlil you encounter a problem of some sort, then turn up the voltage on CPU, RAM and/or chipset and try again.. keep fiddling with it.. watch your temps though as they will rise along with the added voltage.
When you are happy with your OC you start to fine tune it by lowering timings and voltage all around. Trick is to lower voltage and timings just enough for the OC to be stable.
My E2140 1.6GHz currently runs 2.67GHz. I haven't hit a wall yet, so 3 GHz should be possible, for you at least.
Hope this helps. Good luck!