How do you fix your jailbroken iPod Touch?

i have the same problem, but i have come across a few methods that work for other people(except me). Maybe these will help:
1. You can force reboot your ipod (hold down power and home button for 5 secs) every 5 minutesfor about 45 minutes straight.
2. You can plug you ipod into itunes, force reboot it, and wait wait 15 minutes for the ipod to be recognized.
3. If ythere is an update avaiable, then update it . THis will remove any jailbroken software, but i do not believe it will remove cracked apps or free music as long as it is in the proper library.