Ok, I tried stanza for converting, the results were terrible (I lost cover-art, the most formating and the pagebreaks were a little bit strange)....
But Calibre does the job pretty well (Thanks, Harry!), i think i will stick with that.
It's easier for me to convert them, than jailbreak my ipod.
Only thing to do now: I have to convert my whole library (1486 Books...) that could take quite a while.
My iPod will arrive on monday, im quite excited on how my books will look in stanza...
Thank you Deb and Harry for your help.