first off, welcome to itT, melon.

a few things:
1. on emulating the itouch: the processor in the ipod touch is very similar to that of the tablets--same architecture (ARM), almost same speed, though i think the 2nd gen ipod touch is 532MHz, compared to 400MHz n8x0. so, if the itouch is "high processor", then so are the tablets. (i anticipate a few curious posts wondering why anyone would want to emulate an itouch with an n810, but i'll avoid that question for now.) but, yes, in order to emulate the itouch with your n810, you'd need a much more powerful processor, like that of a computer.
2. the easiest way to use a computer processor to do work for the tablet is to just make the computer do the work and display select elements on the n810's screen and also allow input from the n810 to control the computer. this can be accomplished via the internet with vnc (win/mac/linux) or remote desktop (winxp). vncviewer is available here and probably in the 'extras' repo, and rdesktop is here and should be in 'extras' as well.

so... first, you must get an emulator working on a computer. the rest is a piece of cake. anywhere you have internet access, you'd be able to emulate an ipod touch. it still won't be as fast as the ipod touch, though--even if the emulator runs fast on the computer--because of the lag from remotely accessing your computer. oh, and you'd have to leave your computer on all day so it would be accessible to your tablet.

oh, and it's illegal, but you probably already knew that.