See where your user name has been taken
Very Short List pointed me to a really cool website today, usernamecheck.com, where you can enter a user name and see where it's already registered among 68 different websites, from the big ones like Flickr, Gmail, and eBay to weird ones I've never even heard of (Wakoopa? Plurk? Seriously?).
If you don't already subscribe to VSL's daily emails, you should. At least once a week I discover something cool, and it's free, which is always a plus.
