This IS compatible with Windows Vista, I have it running now, but it took a lot of time getting it to work, thus the lack of one star.
However, do not try to install from the CD. The drivers will install, and ask you to reboot. However, upon reboot, the dongle will still not work.
You need the F8T013 Driver Vista32 (version 6.0.1) driver from the Belkin Support site. Unfortunately, I cannot link here due to Amazons strict hot-linking policy. Then plug in the usb stick, and run the "SETUP" File. After this, an icon should appear in the taskbar, and you're able to transfer.
This stick is tiny! I've used it to transfer items off my W810i, and even used my phone as a bluetooth remote control. Really good at tricking people by telling them you have a voice activated mouse whilst you navigate with the phone in your hand. They'll never suspect!!