What's with this Meebo toolbar thing that shows up at the bottom of the page when I come to the site lately? I thought I accidentally installed something and checked my system and it's not on my end. It also only shows up when I visit this site and no others. You know, running software on someone else's computer without their consent is bad netiquette.

it's not some other software - it's a feature (just javascript) on our site so you can interact with your friends. see here: http://www.chess.com/forum/view/community/new-live-chat-bar

[edit]...or better yet, Erik's link explains it all.