XSLTalk email group - XSLTalk is a mature and vibrant email discussion between active daily developers. Very active on a daily basis. - http://www.topxml.com/xsltalk
XSL-list - Discussion of XSL itself, XSL user questions, XSL applications and implementation. An archive of past discussions is available. - http://www.mulberrytech.com/xsl/xsl-list/index.html