Perseus Project
encyclopedia searches -- type in what you want to look up and hit return
Look for:

Site name:
(This field is case sensitive: "Athens" is right; "athens" is not.)

Complex Searches - e.g., searching for "Theseus" on "vases"

Encyclopedia Subject Index - music, vase types, etc.

General Resources
This is an unorganized list, in no particular order, of resources pointing to information on Greece. One of these days I'll organize it; for now it works as a bookmark list to aid me in putting this site together.