What are February 14th, 15th, and 16th? We've known it was going to happen for a while, but now we know when to set our DVRs. A rack of servers -- soaked with natural-language processing, armed with an battalion of esoteric pop culture knowledge, and "represented by a round avatar" -- will face off against Jeopardy! millionaires Ken Jennings and Brad Rutter for three days starting on Valentine's Day 2011. We're also hearing that Watson will sign autographs after it's done decimating its opponents. It will then donate all its winnings to charity and