There are numerous free tools online that help you research and find good keyword domain names to register for your online business. Or simply to buy and resell domain names for profits. I am certain you already use a few of these from time to time.

http://www.whois-search.com
Gives you a list of the best domain names pending delete. Also shows you which drop catchers are successfully catching which names daily.

http://www.whois.sc
Helps you find active, inactive, and available domain names.

http://www.domainname-search.com
Page rank predictor tools and other essential domainer tools.

http://www.Startname.com
A huge directory of domain-related tools, services, resources and guides.

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