The Jeopardy! Tournament of Champions starts running on May 10 and carries through until may 21. The first week is the quarter final rounds where three college champions and the twelve players who won the most games (down to those who won 4 games in the regular season) since the last time there was a ToC (which shot in January 2009 and ran in March 2009.)
My quarter-final game airs on Thursday, May 13, 2010. I understand that in some parts of the country, Jeopardy! is running at a different time than usual due to the sports play-offs. So check your local time and channel to watch.
I recommend watching all 10 days, because the players are just amazing competitors.
The Jeopardy! Celebrity Invitational for charity finals are running this week. I got to watch the final rounds being taped, and I really enjoyed myself. There's much less pressure sitting in the audience.