I recently wrote in this space about Matt Gaffney's Weekly Crossword Contest, in which one of the nation's top crossword puzzle makers posts a new grid online every Friday and invites participants to solve both the crossword and an extra puzzle ("metapuzzle") he builds into it.
This week marks the 100th episode of the MGWCC, which Matt is celebrating in appropriately centenary style with a 100-themed metapuzzle. I thought it was particularly elegant so I'm giving it a shout-out here to alert my literally tens of readers.
The MGWCC is easiest on the first week of any given month and gets tougher as the weeks go by. In a month like April 2010, with five Fridays, the last one can get pretty challenging, so don't get discouraged if you don't solve the meta. You can jump in again the next week as Matt starts over in May (though he has also promised that May's puzzles will be fiendishly difficult, so beware).
Check it out here. You've got until noon Eastern time on Tuesday to submit the answer.