OneLook.com indexes the following electronic dictionaries, plus over 900 others:

# Merriam-Webster's Online Dictionary, 10th Edition: [107552 words]
# EncartaŽ World English Dictionary, North American Edition: [107301 words]
# The American HeritageŽ Dictionary of the English Language: [89248 words]
# Cambridge International Dictionary of English: [66408 words]
# Compact Oxford English Dictionary: [42157 words]
# Dictionary.com: [401821 words]

if you want direct links to any of these, simply Browse Dictionaries at OneLook.

p.s. - if none of these is "good" enuf for you, M-W Unabridged (W3), or OED3 (beyond OED2) are available at a premium, or the latter can be sometimes accessed via your library card.

Last edited by tsuwm; 04/08/2007 3:17 PM.