Registration begins today for the eighth annual ESPN Men's Tournament Challenge Presented by hp and Pontiac on ESPN.com. Registration will begin March 10 for the ESPN Women's Tournament Challenge Presented by hp. Last year the Tournament Challenge games generated more than one million entries.

Both the Men's and Women's Tournament Challenge games are free to users and ask entrants to choose the winners of each game in the upcoming NCAA Division I Men's and Women's Basketball Tournaments. ESPN.com users will be able to sign up for the Men's Tournament Challenge game right up until tip-off of the first tournament game on Thursday, March 20. The Women's Tournament Challenge will accept registration until tip-off of the first game on Saturday, March 22. At the peak of last year's sign-ups, ESPN.com registered 433 brackets per minute, and more than 25,900 per hour.

Tournament Challenge entrants are asked to fill out brackets that select the winners of every matchup in each round - from the opening round to the Championship Game - of the NCAA Division I tournaments. An entrant receives points for each correct selection, with the point values increasing as the tournament moves through each round.

In addition, the Tournament Challenge allows entrants to create personalized groups that will let friends, family members and co-workers compete against each other in a head-to-head format. All entrants will be able to follow their progress and relative standings regularly on ESPN.com. If the Tournament Challenge ends in a tie, the winner will be determined by having the tied entrants answer one tie-breaker question.

The one grand prize winner of the Men's Tournament Challenge will receive $10,000, while the second-place finisher will get $3,500 and the third place finisher will take home $1,500.

The grand prize-winner in the Women's Tournament Challenge will receive an 13-inch flat panel television, and an hp Photosmart 850 digital camera. Three second-place winners will receive an hp All-in-one printer/scanner/copier, while five third-place winners will win an hp Photosmart 230 Printer. Seven other entrants will receive an hp Photosmart 320 digital camera.

Other NCAA Tournament Coverage by ESPN.com

All entrants can find help in making their picks from ESPN.com's Joe Lunardi in the Bracketology section of ESPN.com. The section - which has been online since Jan. 6 with weekly updates - features a breakdown of the NCAA Tournament hopefuls, a constantly changing bracket of probable tournament seedings, and further analysis. Additional Bracketology content and further breakdown is available to ESPN Insider subscribers.

Coverage of the NCAA Tournament on ESPN.com will begin Selection Sunday with a complete tournament section, including separate regional pages, in-depth team pages for each team in the tournament and the most up-to-date coverage of developing news and events. A team including ESPN.com's Andy Katz, and ESPN's Dick Vitale, Jay Bilas and Curry Kirkpatrick will provide tournament and bracket analysis, while each night the ESPN.com Full Court Press will look at how the tournament is progressing. ESPN.com's tournament coverage will also feature: interactive polls and chat sessions, a complete guide to tournament history, a nightly photo gallery, and a trivia quiz.

Fans can find information about the Tournament Challenge games - including eligibility and registration restrictions - at http://games.espn.go.com