Remote wipes work on a BES account, but it won't work on a 'non-BESified' BlackBerry. The other nice thing about the BB devices is that if they try to login unsuccessfully 10 times on a locked device it wipes the device.
I think the remote wipe also works on Windows Mobile and Android, but I don't really have anything to base that on (going strictly from what I think I remember someone telling me

).