http://whois-it.info, from the site: WHOIS IT Is a fast, easy ajax whois domain checker. To use it simply type in the domain name without the TLD (.com, .net, etc.). It will almost instantly tell you wether than domain is registered. If it's registered it displays, if it is green it is avaliable and subsequently provides you with easy links to some of the top domain registrars. It's really useful for looking for vcvc llll domains and such because you can just type combinations and you don't have to press a go button or anything !