I have for sale a used 3 Mobile Broadband Dongle. It has been unlocked, and has been tested as working on XP and 2000. I have it working on Windows 7 too, but as I don't have Vista I will assume that it won't work yet on Vista.
Works great with XP netbooks, and obviously you can put any sim into it from your favourite network. Should work on Acer Aspire Ones with Linux, but again cannot test that.
Comes minus the cap, but it excellent cosmetic condition.
included in price - 1st class.