Microprocessors:

Advanced microprocessors represent the state-of-the-art in digital system complexity in a single chip. Berkeley’s CPU Info Center has lots of interesting information, including a photo gallery of microprocessor chips and history of microprocessors.
 

Computers:

Digital computers are probably the most visible applications of digital systems technology. The Computer History Association of California maintains a directory of web pages about history of computing, electronic calculators, and pre-electronic computing -- neat stuff!