The WowWee Chatterbot would make a cool companion on your desk. Chatterbot is a USB-powered animated computer accessories which can tell jokes, dialog (no idea up to what level) with you as well as comment on whatever you're typing on the computer at the moment. It functions well with email, calendar and instant messaging applications among others, boasting a tiny speaker too.
Apparently the trigger responsiveness is not up to par at the moment, so hopefully WowWee will be able to roll out an update in the near future. Available in Devil/Angel, Dog, and the Fairy Godfather models, the $49.99
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http://www.newlaunches.com/archives/wowwee_chatterbot_a_tacky_desk_companion.php