http://www.sex-lexis.com
http://www.synomizer.com Synonyms
http://www.acronymfinder.com
http://www.effingpot.com Britspeak
http://www.peak.org/~j.php AE-BE|BE-AE
http://engrish.com "All your base are belong to us"
http://fonetiks.org/index.html Phonetics
http://www.wordinfo.info/ Wordinfo
http://www.etymonline.com Etymology
http://www.oxid.ro Interesting browsing-features
http://www.juiciobrennan.com/hyphenator/Hyphenator
http://www.speech.cs.cmu.edu/cg Pronunciation Dictionary
You think you know "a certain word", or you´ve heard one somewhere but you have no idea about the rihgt spelling ?, that´s why you can´t find any entries in dictionaries ?, Go there, do the spell check with your similar misspelled word and find so "your" correct spelled word:
http://poets.notredame.ac.jp
(Great Performance)
http://www.spellcheck.net/
If you want to find some special slang expression or such idioms go to Google and do some lookups there. Maybe you have to disable SafeSearch. You could search for urbandictionary for example, or just double-click on: urbandictionary
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Chat with a robot (Loebner Prize Winner)
http://www.rong-chang.com/tutorframe.htm