well, i thought i read somewhere that 1.1.5 couldn't be jailbroken, but apparently i miss-read. and i wasn't going to update to the 2.0 updates because it wasn't even my ipod(was doing this for my cousin), but i decided i'd update later on to make life easier for me and her and she would pay me back the $10.
if your going to jailbreak get yaself 2.2 it's miles better than 2.0
you can get 2.2 here: http://www.felixbruns.de/iPod/firmware/ (second drop down select iPod Touch 1G (2.2/5G77) no $10 fee involved)