I don't know if it's possible to jinx these things with blog posts, but I'm going to go ahead and risk it: Blue Jays pitcher Dustin McGowan has a no-hitter going through 8 innings. Just one walk allowed, too.
This sort of comes out of nowhere for McGowan... he's 3-3 on the year, with an ERA above 5, and in his career, has never gone longer than 7 and 2/3rds innings. If he's able to complete the no-no, I believe he'll also set the major league record for largest mutton chop sideburns worn while throwing a no-hitter.
(UPDATE: Son of a bitch. Jeff Baker broke it up with a base hit to lead off the 9th.)
(UPDATE II: He does get the complete game, 1-hit shutout, however.)