Just found this brand new MSN Robot, and it is the most human like robot so far. It will argue, swear, bring back search results for you, talk to you when you are bored, etc - I have tried it and it is great. It learns as it goes along and it is active almost all the time. Just add auto.msn.bot@hotmail.com and it should add you instantly.
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"Dont argue with an idiot, he will just drag you down to his level and beat you with expeirence. Dont argue with me, ill drag you down to my level and beat you with a baseball bat"