I've been able to get this working on my MacBook. The process I used was:
1. clean install Leopard (not Snow Leopard)
2. install dongle software and check it's all working, leave dongle plugged in
3. upgrade to Snow Leopard
3. in network preferences, delete the 3Connect location
4. switch to Automatic location and click the + button
5. add the ZTEUSBModem device
6. put phone number "*99#"
7. click advanced, select vendor "Generic", Model "GPRS (GSM/G3)", APN "3internet"
I can now connect and disconnect without using the 3connect application and it seems to be working perfectly. It has the added advantage of not messing up my network settings and requiring reboots as the awful 3connect app did.
With regards to installing on a clean or upgraded Snow Leopard, the issue will be getting the right kernel extensions into the right folders. It may be possible by exploring the files in the 3connect package and manually putting them in the right places. If anyone is desperate for this and if I have time I can try installing onto my Mac Pro and see if I have any luck.
Message was edited by: Lee Collier