I highly doubt you'll find a supported processor for one main reason - heat.
Laptops are more thermally engineered than desktops, except the ultra-small-size-of-a-ream-of-paper HTPC's. While you might be able to successfully upgrade the processor in the same family a little, going to a different family of proc's typically results in a boot failure (due to an unrecognized processor), a much slower machine (due to a higher FSB processor running at the slower FSB), or a constantly shutting down due to heat.
I'm not saying you CAN'T try it, but I doubt you'll be successful.
the thing is on the acer website they list processors with 800mhz fsb and up to 2.2 or 2.4 ghz
the only thermal problems ive had is the vid card
but I would really love to be 100% sure before I drop $200 on a higher clocked processor