Ten Things for the Dictionary Lovers
1. The Biographical Dictionary contains the names and short biographies of "more than 33,000 notable men and women who have shaped our world from ancient times to the present day."
2. Author Craig Conley offers a number of unusual dictionaries online, including ones with All-Vowel Words and All-Consonant Words.
3. If you need a specific type of dictionary but can't find it, check out Glossarist.com -- they collect links to different dictionaries, glossaries and such on the web.
4. When a stun gun just won't do: the Gun Dictionary, the Knife Glossary, the Japanese Sword Visual Glossary and (sort of) a dictionary/encyclopedia of explosives, Flash! Bang! Whiz! - An introduction to propellants, explosives, pyrotechnics and fireworks.
5. Dragging 9,000 obscure English words kicking and screaming into the light of day: Luciferous Logolepsy.
6. The Phrontistery's collection of word lists includes some obscure ones over at the International House of Logorrhea.
7. There are a ton of quotation dictionaries out there, but I like Mark Fryer's Quotez.
8. Get your slang on with the Urban Dictionary
9. Words = art: The Visual Dictionary.
10. The last word in words, YourDictionary.com, has a great page of links to specialty dictionaries.
Finally, if you'd like to simultaneously search 931 dictionaries with a total of 7,563,812 words, try the dictionary search engine OneLook.