Where can I find information about a certain domain name?
There are a lot of WHOIS and “is this domain free?” lookup tools online, but at the moment I like this one the most:
Pros: Easy to use, clear interface, a lot of extra features (like similar domains that are registered or have been in the past, a typo generator, Google toolbar and Firefox plugins).
Cons: Number of searches is limited per day, unless you pay.
Status: tested it, liked it