Launching Next has discovered 4 vocabulary startups.
RAPID VOCAB
RAPID VOCAB: Learn American English Fast!
SnapWord
Learning vocabulary by taking photos
Ed Prep
Learn vocabulary using mnemonics
NetLingo The Internet Dictionary
This site contains thousands of definitions about computers, the Internet, and the online world of business, technology & communication :-) A popular online dictionary it includes one of the largest collections of text messaging, acronyms and smileys!