Jailbroken iPod touch stuck in boot
Leave it for an hour or so. If it still isn't booting, you need to restore your iPod.
I would do this ASAP, because Apple is readying for the 6.1.1 release, which may block the current evasi0n exploit.

To force restore your iPod, enter DFU mode as shown below:


Connect the device to your computer and launch iTunes
Turn the device off (hold down the power button and home button at the top of the device)
Hold down the sleep/power button and home button together for exactly 10 seconds, then release the power button 
Continue to hold down the Home button until a message appears in iTunes telling you an iPod in recover mode has been detected


After that, it should work in iTunes and you can restore.