Instant Domain Search - Search domain names instantly by showing results as you type.
Domainr - Domainr
NameBounce - NameBounce is an intelligent domain name and business name generator. Discover hundreds of new business name ideas with available domains, all for free!
Wordoid - Wordoid is a web application which helps to solve a common problem
Panabee - Best way to search domain names, esp for apps and startups
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability