surfing the net via bluetooth?

Do you mean connecting to the internet on your phone using your PC's connection, or surfing to the internet on your PC using the phone?

If it is the former, then Nokia removed the ability to do this with the 6600, but you can do this on the 7650 and 3650.

If it is the latter, then your Bluetooth software should have installed a COM port for dial-up networking. Simply create a new DUN connection in Windows using this port, just as if it was a regular modem.

Cheers

This is not the first time this has come up. Many people want to use the Bluetooth connection to surf the net. Check out this earlier thread in case any solution gets proposed. And don't forget to take the poll to get the programmers working on the solution..
http://www.allaboutsymbian.com/forum/showthread.php?s=&threadid=18892

Best of luck!