Ubuntu & Trust/Conexant adsl usb modem
Here's another suggestion to Linux lovers 
or who want to give it a try 
Latest kernel supports Conexant Accessrunner ADSL USB Modems! 
w00t!!
Anyway you can still compile it on your own. I found this good guide (in Italian but google should do)
http://wiki.ubuntu-it.org/DigicomMichelangeloUsbCx?highlight=%28michelangelo%29
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