I have previously played around with the SingTel BBC client on my CIngular Treo and I stopped using it primarily because of the need to manually disconnect from BB.net in order to surf the web and check IMAP email, etc. In other words, it did not automatically switch between APN's.

I am curious to see whether the officially-sanctioned Cingular BBC client behaves differently and does the switching as-needed. If so, I might just switch from my BB 7130 back to my t650, at least until the BB Pearl is released.