PCbeaconbot-not infoseek. I wouldn't serve them your content, look at the site associated with this bot, and you can check things out from there. Search for the UA, I won't give them the courtesy of dropping their home url. Just use your favorite engine, and I'm sure you'll find what this one is about. Or I can email you in your stickymail, if you like.
Jack- This one still is a mystery to me, but I've yet to see any proof of it relating to infoseek. It's hit me from some isp IP's before, and I don't let it have anything...but have you found a connection to Infoseek? I'd be interested in checking that out.
The other UA seems right, though. Thanks for the heads up.