http://win.comcast.net/#landing is the True Fan trivia contest run by comcast.net with many prizes offered for answering sports trivia questions.
http://www.basspro.com/webapp/wcs/stores/servlet/CFPage?storeId=10151&catalogId=10001&langId=-1&appID=347&template=sweeps.cfm is your chance to win a boat or other fishing related prizes.
http://www.nascar.com/promos/armorall/2009/sweeps/ is for Tony Stewart fans who would love the chance to meet him and win VIP racing tickets or other associated NASCAR/Tony Stewart merchandise.
http://www.myphl17.com/pages/contest_tna is for Philadelphia fans wanting to check out TNA Lockdown, the grand prize is apparently front row seats. You will have to live there though because there is a secret word involved that my guess is, you will only find on their channel during a broadcast.
http://www.pwinsider.com/ViewArticle.php?id=37345&p=1 and don't forget to enter this contest for Wrestlemania shirts, hoodies, WWE DVD's and other assorted items but you have to do it before 7pm EST on April 5th.