getting back to the point
after jailbreaking and installing 3rd party apps how does this affect the normal running of the phone and the apple apps ( can normal apps still be downloaded and installed , can it still be connected to itunes for music ? . Btw the battery life is unaffected after the upgrade and multitasking at least for the simple things like accessing something in the phone seems a fairly standard need , ie looking up contact info, notes, or mails while on the phone