Blogarithm.com! - So many blogs, so little time..can you tell me when they post something new?
As the website says "Blogarithm (http://www.blogarithm.com/index.php) lets you easily manage all the blogs (or any other pages you'd like!) that you track. Any time one or more of the blogs you read changes, you'll get BlogMailtm - a morning email listing all your blogs that have new content - including excerpts when available!"

Cool huh?