http://www.designpattern.lu.unisi.ch/index.htm
HPR is an initiative of ACM-SIGWEB in collaboration with the University of Italian Switzerland. Its goal is to allow a larger community to reuse design experience gathered by other designers of hypermedia and Web applications and systems, by providing useful Design Patterns.
HPR currently hosts 28 Design Patterns
See also http://www.IAwiki.net/WebsitePatterns