I'm looking for a book or website that would give me a good reference on Fish Id. Any Suggestions.

The Reef series by Paul Humann is probably our most used set. They just came out with Edition 3. They have Reef Fish, Reef Creatures, and Reef Coral identification. We just ordered the third edition for ourselves. I also like the Fish Behaviors book from the same author.

Jake tells me the 3rd edition Reef Fish, 2nd editions of the Creatures and the Coral are the most current ones.

Also, checkout http://www.fishid.com/
Chet

Here are two online options:

this one is free and pretty comprehensive:
http://www.fishbase.org/

this one charges a membership fee:
http://www.coralrealm.com/homepage.html

Here is one more site:

pretty limited, but has some of the most commonly found species:
http://www.reef.org/webres/gallery.htm