I too am tempted oce again to return to 1.1.4 even back to 1.1.2
Think iTunes 7.5 and Downgrading of the baseband is required, simple few clicks involved and a lot of finger crossing
Then run iLiberty+ for the jailbrea and bingo
I had a look around and it seems like you have to use iTunes 7.5, and Ziphone to refurbish the baseband and then you can unlock again.
I've updated to 2.1 and so far so good, its been perfect so far.