One of the more innovative blogs I've seen is PuzzleBlog (formerly Scrabblog). It's really a blog in format alone; the content is a series of puzzles, one per entry. Visitors are encouraged to give solutions in the comments section. For now, there are two games — a Scrabble variant (where you try to get the most points) and a math game.

I'm proud to say that I solved the latest math one, in splendid fashion, but it's largely due to the fact that the commentor before me almost had it.

No more comments! Either someone has violated Godwin's Law, I'm tired of the discussion or, most likely, the ten-week window has closed. You can, however, contact me through email.