Works like a charm! Launch2net's driver is the only way I found to get my 3G USB dongle to work (ZTE MF112) on my 64-bits MacOS Snow Leopard (the brand new MacBook Pros boot in 64-bits as default) without having to reboot in 32 bits mode.

I indeed discovered with dismay that my newly-bought USB 3G Dongle from Three Mobile UK comes with absolutely no driver for Mac 64-bits, and no warning from the seller or any help from Three. Either have to reboot in (slower) 32 bits mode every time I connect (pressing 3 and 2 at boot), or, much more convenient, use Launch2Net which did the trick brilliantly. Chip in the possibility to test it for free, the simple interface, and the email reactivity of Novamedia to enquiries: well done!