WHY WHY WHY doesn't the Gnutella system make use of a simple CRC tag? It's a method as old as the hills, and it works.. If the file information transmitted over Gnutella contained both file size and a CRC, you could be absolutely certain that you had the same file, even if someone renames it.. It's not like CRCs are hard to calcutlate or take a lot of bandwidth to transmit, hell even the old Punter file transfer protocol had CRCs, back when I was using 300 baud modems and transferring 100k took all night...
Ahhhhh.. /rant off

- Mantar