Better-Whois Is exactly that. A more accurate version of the standard WHOIS domain search still used on thousands of web sites. Better-Whois lookups domains in a shared domain registry, locates which registrar has reserved the name and visits and queries that registrar's database for the correct information. A useful site for domain hunters and checkers.
Domain-It! Provides Internet users with a fast and efficient means to conduct all of their domain name management business. The site has a wealth of information, resources and tools related to domains, hosting, business, email and much more.
NameBoy.com A handy service that can quickly provide available domain names for your chosen keywords. A real time server for anyone trying to find the ideal domain name.
DomainTools.com A popular site with a number of useful domain tools, including search and suggestion tools. Also, has domain auctions, a domain directory, etc.
JustDropped.com A handy site if you're looking for good domain names that have expired or are about to expire. Registration required.
DomainsBot DomainsBot, is a name suggestion tool for domain names. Rather, it is what a name suggestion tool *ought* to be: intuitively able to learn from user queries, easy to use, free, and very addictive.
DomainInformer.com Provides a wealth of useful information and tools related to domains. Definitely worth a visit.
Flippa A unique auction-based marketplace for buying and selling websites. Buyers have access to comprehensive information on established websites and online businesses for sale; sellers can connect with a large audience of interested and informed buyers looking for good prices and premium websites.
NameJet Monitors domain name pre-releases and registry drop lists. Daily updates allow domain professionals, businesses, and individuals to acquire domain names and those that just expired. The easy-to-use interface makes it simple to track and manage the domain names you want.
DNforum.com An on-line forum, offering free registration, dedicated to all aspects of domain registration such as sale, auction, purchase, brokerage, appraisal, etc..
WhoIs.net Provides a helpful domain-based search service. Find available, deleted, on hold domains or data for registered domains in seconds.
Sedo.com A global marketplace for buying and selling domain names and websites. Over 3 million high-quality domain names in a searchable databse.
DNJournal.com A domain news resource. Almost everything you might want to know about domains can be found at this site. Worth a visit and a bookmark.