Patterns home page OR at Hillside
Alistair Cockburn's Home Page (Human Centered Software Development)
Patterns and HCI from Jan Borchers
AG Communication Systems Pattern Page (With links to a Pattern Template...)
ChilPlop (Annual conference)
Pattern Languages of Programs Conference Home Page
Pattenrns for Human Computer Interaction and also The Ineraction Pattern Home Page
Pedagogical Patterns Home Page
The Design Patterns Study Group of New York City This group has a number of subgroups (Analysis Patterns, Design Patterns...) They have regular meetings to discuss patterns of various kinds.
Doug Schmidt's Design Pattern Page