Find Installous, Install it.
Damn, haven't jailbroken my iPod for a LONG time. The first time I did it, I loved it. Free apps, music, everything! Then, something happened. I wanted to transfer something over to my iPod, and iTunes wouldn't let me unless I updated. So, it asked me to update and when the update finished... my whole iPod was wiped. No music, no apps, nothing. It was like I bought a whole new iPod. I don't jailbreak anymore. I think it was due to the fact I had jailbroke my iPod, the update had wiped my iPod.
Also, you need Installous.