There are plenty of decent domain names available for startups that you can registr for $10. If you can't think of a good name, try using a domain name generator like www.namestation.com
This is a web app for holding name contests. It has lots of customization options, including logos and photos, Facebook and Twitter integration, custom rules. Participants can submit and discuss entries and vote for their favorites, contests can have multiple phases and voting rounds. Think Doodle for finding the right name. Please post feedback.