This is a reply to an old post, but may help others with the file exchange listings
Go to: Home > Library > Preferences and locate the com.apple.bluetooth.plist
and the com.apple.fileExchange.plist and send both to trash "don't delete yet"
Remove your items from isync by highlighting each item then toolbar > delete
Go to your device and remove/delete the list to the Mac.
Add the device that you would like to currently use ( bluetooth set-up )
and re sync the device.
File transfer will now only show current device and no other, this works on 10.4 but it may be similar to 10.5 (worth a try) once completed delete the trash.