Canadasy, while I do not know of anyone who has actually been charged for Data, the website specifically says Unlimited Email add on and t-mobile reps have constantly said that web data will be charged.

As far as I know it depends on the interntaional operators ability to seperate the different types of GPRS data.

I am interested to know if you are using BES or BIS. I may be wrong, but my understanding is there is no way for the operator to know if BES traffic if email, web or whatever because its all encrypted. If you are using BIS though, blackberry email traffic will be very different from web traffic that goes over their own systems.