Microformats to Bluetooth
It requires the Widcomm bluetooth drivers (they're the most common, if you have c:\Program Files\WIDCOMM then you should be good to go).
I've tested it successfully on my Win XP machine to a Nokia 6230 and a Qtek S200 Win Mobile phone (aka SPV M600). It sends contacts and events, though events didn't work on my Nokia.
I don't have much available for testing it so I'm relying on some detailed feedback. I may not be able to fix it for you though!
A friend tested it on a newer Nokia, it received the file but failed to recognise it as a vcard to import. I've yet to find a way to use the bluetooth business card service, so I'm sending it just as a file transfer and relying on the device importing it. It'll probably require an XPCOM to use the Widcomm API, but this script should work as well as it's Mac counterpart.