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Although everything has worked fine on several phones, use this instruction at your own risc. Tested on the newest firmware 4.09.1. MacOS X 10.3.5.

System Preferences/Bluetooth
Set up new device. Add the Nokia 6600.

Applications/Utilities/open Bluetooth Serial Utility
New...
Name: Bt
Port Direction: Incoming
Port Type: RS-323
No other changes.
Confirm with ok.
Quit.

Download this Apple Scripts.
(Thank you to http://www.technohappymeal.com)
If the Mac is connected via Ethernet to the internet, start the "Share Ethernet to Bluetooth" script.
You will be asked for the admin password.
(If you want to stop the bluetooth sharing, run the "Stop Sharing to bluetooth" script.)
(Sometimes you will have to reboot to start the share script again)

Download gnubox6600.SIS.
(Thank you to Mika Raento; http://www.cs.helsinki.fi/u/mraento/)
Install the App on the Nokia 6600.

On the Nokia 6600:
Tools/Settings/Connection/Access points/Options/New access point (use default settings)
Connection name: Bt
Data bearer: Data call
Dial-up number: anything (eg 5555)
Authentication: normal

Options/Advanced settings
Primary name server: 192.168.0.1
Use ppp compresion: yes
back/back

Start gnubox
Options: 2box Direct/bluetooth
(If you don't want to surf any more, change this back to 1box Phone.)

That's all. If you want to connect to the internet choose Bt. Opera etc. works fine.
If you want to surf on wap sites, don't forget to change Services/Options/Settings/Default access point to Bt.

Yours

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