Architectural Drafting
Architecture Design Images History 3D Models and more - Artifice Great Buildings Online
Formerly known as Great Buildings Online, "this gateway to architecture around the world and across history documents a thousand buildings and hundreds of leading architects, with 3D models, photographic images and architectural drawings, commentaries, bibliographies, web links, and more...
Architecture Web Resources
The University of Nevada Las Vegas Libraries maintain this extensive guide, created in 1993. "Topics covered by this guide include architecture, building and construction, design, housing, planning, preservation, facility management, energy and the environment, and landscape architecture."
Digital Archive of American Architecture
Prof. Jeffery Howe's collection of 15,000 slides, acquired over the 20 years of his teaching, were digitized and placed on the Web "with the assistance of a Boston College Teaching and Advising Grant, and undergraduate research assistants provided by the dean of the college." The collection was originally constructed to supplement Prof Howe's course, "FA 267 From Saltbox to Skyscraper: Architecture in America." He has a related site, Archive of European Architecture.
Architecture: Image Resources
Learning and Information Services, London South Bank University, maintains this annotated list of links to sources for images.