I have always (forever) associated domain names and agent names to flag spiders. Occasionally, I will look for just domain names, but it is rare. So I never notice Bablefish users at all. That was until today when someone visited with Scooter for an agentname from Bablefish. I fully look for 'the fish' and work accordingly. However, I never knew that the fish passed on the users agent name (or forgot is more like it). Something to consider...
