NASCAR has its own issues (1960's and 1970's engine technology?), but it's fun to watch.
I still talk about the catch Jeter made against the Red Sox on 01 JUL 2004 at Yankee Stadium. The catch itself wasn't that special, but the fact he went flying into the stands afterwards (and that he probably knew that he'd have to fly into the stands) is what made it so good.
Then again, David Wright (the Mets' 3B) has been making a name for himself these days with his crazy antics in the field...