I would like to second this. ETPro GUIDs would be a nice resource...... Even better, if EvenBalance gave us a hardware identification method it would hurt cheaters (basically like etpro GUID, but reliable). I know they have the capabilities because they've had "hardware bans" for years. Why won't they give us a method??
PBBans should implement ETPro GUID for the purposes of evidence collection IMO, as Zombie says. But also, PBBans and PsB should push EvenBalance relentlessly for a method of hardware identification. I think that of my 100+ busts, there are only 60-70 cheaters (educated guess)... We could crush repeat offenders if we had an ID based on hardware, or at least give them a little more work to circumvent a ban.