thanks guys for the replies.
some more questions from a newbie.
I recently bought a 16gb micro sd class 6. do I have to set the full capacity when I install nitroid or I can select 8gb?
can I install both nitroid and meego wiht 8gb for each OS?
which should i use for this? multiboot or u-boot or something else?
if I cannot do that and I want to install nitroid just to check it for a few days, is it an easy process to uninstall it and install meego?

thanks