Another t-mobile Uk user here, has been having the same message with app world.
I havent, but my GPRS has been going down to gprs and I currently cant get it back.
I would say *guess* theres a data problem somewhere in the UK/RIM servers etc.
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."