Any idea what caused Guests to end up in the Bots section before Giz's last list?
Also - I would remove the .com from StumbleUpon.com -- or at least add:
StumbleUpon=StumbleUpon
I'm not sure if I added the .com to the wrong side, or, whether it was another one of their bots. But without it works (because it's on my site right now lol)