I have entered both "Life, Love, and a Polar Bear Tattoo" and "Seven Exes Are Eight Too Many" in a 100-word contest at the Book Ends Literary Agency blog. My entries are available at their blog. First prize is a critique of my first chapter, query letter, and synopsis, which would be fabulous.
I got myself a little upset after not winning the last contest, so we won't be doing that again. If I win, marvelous. If not, no worries. (Plus, I found a few spare words to cut from each book in preparing my entries, so that's good too - there, I won already. :)