httprecon project
advanced web server fingerprinting
"httprecon is currently one of the best tools for fingerprinting web servers." - Sub-Zero, security-freak.blogspot.com
The httprecon project is developed and maintained by Marc Ruef.

marc.ruef at computec.ch (PGP)
http://www.computec.ch/mruef/

See http://www.computec.ch for more information about computer security.