Bloglines

I submit to a number of blogs and it's a pain to check each of them in turn to find out if there are any new posts. But Bloglines can do this for you. You simply tell it which "feeds" to watch and it tells you whenever there's a new post. You can even download a "notifier" that sits in your system tray and pops-up whenever there's a new message (warning: this seriously interferes with your work).