I know how it is: you sign up for a new social networking site and you spend the better half of an hour trying to come up with the perfect screen name. That's what happened to a majority of my friends when they signed up on Twitter.With Tweexchange, you can type in your preferred name and see if it's available. What's stopping you from just typing it into Twitter, you ask? Well, Tweexchange gives you alternatives that come close to your perfect username if it happens to be unavailable. Plus, you can search for domain names to match if, in case, you want to launch your own website in the future.