If you have been impatiently waiting for a chance to jailbreak you 2nd Gen. iPod Touch, here is your chance.  For $15 you can get NitroKey Slipstream which will do the Jailbreaking for you.  During the process, the software jailbreaks your iPod, and installs Cydia.  This jailbreak works with 2.2.1 and they also offer support.  Although their efforts are noteworthy,  never have you had to pay for such an app.  If you need those 3rd party apps, $15 may be a bragain for such an experience.  If you can wait, we bet iPhoneDevTeam comes out withtheir app soon.