http://theido.............................s-and-i-touches.html
make sure you have the onlder version of itunes... not itunes 7.6
and unless you are a developer or want to help develop, don't upgrade to 1.1.3 after jailbreak... it is still so buggy and people are still trying to make third party apps work with 1.1.3...
i would keep it at 1.1.2 jailbroken until you get the all clear..
i am still working with some of the new apps for 1.1.3 and now my installer wont download or uninstall any apps i have!