Ancient Sources
Perseus: The Classics Page at The Perseus Digital Library at Tufts University with texts (in modern translations and ancient original languages) and images from the classical world, as well as modern essays and arguments.
The Internet Ancient History Sourcebook at Tufts University has links to complete works of most major Greek and Roman authors as well as selections on specific topics.
The Internet Classics Archive at MIT.

Rome
De Imperatoribus Romanis, An Online Encyclopedia of Roman Rulers and their Families
VRoma, a virtual community for teaching and learning Classics

Women
Diotima: Materials for the Study in Women and Gender in the Ancient World
Women's Classical Caucus

Research Tools
GOOGLE: Good for general searches and searches for images.
WorldCat: search for library books not in Sage or Prospector

Art
Museum of Cycladic Art, Athens. This is one of my favorite museums, and it has a fine website.
Art History Resources on the web has EXTENSIVE links to art oriented websites from prehistory to today.

Maps
Excellent maps available at the Rome Project at the Dalton School.
Excellent maps on the map page of the Interactive Ancient Mediterranean Project, enhanced and growing at the Ancient World Mapping Center with their maps for students map room. Links to more maps are also available at the Ancient World Mapping Center.

Local Colorado Classics and Ancient History
Lecture program for the Archaeological Institute of America in Denver
Lecture program for the Boulder Society of the Archaeological Institute of America.
Phi Alpha Theta, the History Club and Honor Society occasionally presents lectures in the Ancient World.