Apple iOS 4.3 due March 11, Hold off
March 11th is the due date for the next iOS release, which supports ipad2. Therefore do not update and wait for the next jailbreak release. This time, take some extra caution because it brings apple’s implementation of address space layout randomization (ASLR).
what is ASLR
ASLR will mess up the way mobile substrate works. You will need a new mobile substrate in order to use your favorite tweaks such as winterboard, sbsettings, bitesms, folder enhancer, etc. So you should definitely avoid 4.3 until an “official” jailbreak is released for it.