What happens when you try to surf? Do you get an error message? What happens if you ping www.blackberryforums.com?

You might want to take a look at SharkModem. I have used it for hours at a time since it was release last week. It works very well, and it's fairly easy to set up. The only weird thing is that you have to configure your mail client and browser as if they are connecting to a proxy server.