BayXP: The San Francisco Bay Area XP Users Group.
Calgary Agile Methods User Group (CAMUG): CAMUG provides a focal point for the use of agile methods in software development organizations in Calgary.
Category Xp Users Group: A public list of Extreme Programming user groups across the world. [Wiki]
Irish XP SIG: Home discussion list for the Irish XP SIG.
SPA-NW: A group specifically devoted to round-table discussion of agile software development practices and processes. Group serving the UK's northwest.
Toronto XP Users Group: Discussion on XP in the Toronto, Canada area.
XP Austin, TX: Yahoo! Groups site for a group of people in Austin, TX, who discuss and practice Extreme Programming.
XP Melbourne, Australia: A venue for XP enthusiasts in Melbourne, Australia to meet and share experiences and strategies related to agile methods, including XP
XP Montreal: Discussion group for XP users in Montreal.