For Mac users there is a pretty cool feature called "sticky notes" It's VERY similar, but it sits on your desktop, you can color code and they are small.
Brennan @ShaneeK: Sticky notes can be useful, but they don't show you one task at a time. I find this the most useful aspect of NowDoThis. Plus the satisfaction of clicking "done".
I've long had a love/hate thing with Craigslist. I use this a LOT to find new clients (when I'm bored). It's so frustrating to see the same "Get Rich without Working" postings in ALL of the cities. I wish those people would just go away! Searching for a job there, you are sure to find a few gems, but you have to wade through all of the terrible SPAM.