It's already possible to do this--you have to install an sftp server and use that protocol after creating a network connection. If you follow the directions at webOS internals to gain root access, the script they have you run already provides what you need. Then you can just use a SFTP client on your computer to transfer files.
As for doing it like most phones (via OBEX BT profile), I think that's kind of a tricky one. There may be enough Linux tools out there to do it, but I would imagine that Palm is already working on it (without infrared, this is one of those notable absences on the Pre).
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Palm III-->Handspring Visor-->Sony Clie PEG-NR70-->no PDA  -->Palm Treo 755p-->Palm Pre-->HP Veer
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