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Find high-scoring words when playing Scrabble, Lexulous, Scrabulous, Literati, Word Twist, or any anagram-based game. Just enter the letters you have in your rack, and see the words you can make. Optionally enter letters already on the board to use them as well.

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ARIN's WHOIS service gives contact and registration information for IP addresses, autonomous system numbers (ASN), organizations or customers that are associated with these resources, and related Points of Contact (POC). It doesn't include information on domain names or military networks.

Look up any word in Dictionary.com's meta dictionary

Give Yahoo's email address search tool someone's name, and get a list of email addresses

Internet dictionary of slang words and phrases. More than 5 million street lingo words and expressions have been defined by the Internet community. The definitions on Urban Dictionary are meant to be those of slang or subculture words, phrases, and phenomena not found in standard dictionaries and tend to have the newest words. Entries are checked by volunteer editors and rated by site visitor…

MyFreeEmailSearch.com contains the world's largest publicly available directory of email addresses, which can be used to locate old friends and classmates, find current information related to email, address, and phone, and access to profiles from over 20 social networking sites.

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Find web pages tagged with a word by other users. Great to find the most important sites for a word.

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blekko's web search uses slashtags that narrow your search to only the sites or concepts you want