Buffalo Spanish Language Enthusiasts

Probably the most useful resource for beginners and experts alike.  Not only does it have two Spanish/English reference dictionaries, but it also has forums in which native speakers from all Spanish-speaking countries discuss, and often debate, the meaning of certain words and expressions.  

Spanish / English Bi-Lingual Dictionary and Forums

Quite simply THE definitive reference.   

Spanish Dictionary

Also related to Fluencia language learning site.

Spanish/English Dictionary and Tranlsator

The French weigh in on the Spanish/Elnglish game.

Spanish / English Bi-Linugal Dictionary

Another well-known language resource.

English /Spanish Dictionary and Other Resources