Good news! Thanks to some intrepid beta testing by new 8800 owners, I've released a modem script that allows you to tether your 8800 to your Mac via Bluetooth. (For the curious, it's essentially identical to the script for the Pearl.)
If you've got an 8800, you can read more and get instructions here.
If you run into problems, post a comment there and I'll try to help out. I'd appreciate speed reports if you're successful - I'm curious if the 8800 suffers from the same slow upload problem the Pearl has.