You have to know...

Jailbreak=More Apps like Backgrounder etc with it you can have real multitasking on iPad. I heard something about less Battery but dont know if its true... Teorethicaly you can download install EVERY app aviable but pls use cydia and not an not trustet rep, because when you ...

Yes and if this don't work, try hardreset: HOLD Power/Standby button+Home button, for a long time. Then it should Restart. The restart take longer than a normal!