Web Site Garage
Offers a "free one page tune up" of a user-submitted website.

Webperf
Analyzes the technical parameters of websites and servers, from the Standard Performance Evaluation Corporation.

TPC-W
Analyzes the technical parameters of websites and servers, from the Transaction Processing Performance Council.

Bobby
Analyzes web pages for their accessibility to people with disabilities. 

PICS
A system of labeling web content with metadata that can be used to screen websites for objectionable content.

See Bauer and Scharl (2000) for further information about these new analysis systems.