My Palm T3 came with such an app built-in. I never got to use it in practice. One of those applications that immediately looked like it would be very useful, what with collaborative "whiteboard" interactions over bluetooth etc. In the real world this doesn't happen though. Well, sending contact info over bluetooth _is_ used, and it's very useful. The rest isn't, really. You can already send a contact to a Nokia tablet via BT, it'll end up as a .vcf file on the N800 (vcard). Off hand I don't remember if it can be imported into contacs, I think it can but as the contacts database in OS2007 is rather limited it would probably strip out a lot of the vcard info.