coComment - Firefox Extension
http://www.cocomment.com/tools/extension
"automatically enables coComment on supported blogs (bookmarklet no longer needed)"
coComment - JSON(P)
http://www.cocomment.com/json
comments-formats - Microformats
http://microformats.org/wiki/comments-formats
"This page serves to document the current list of comment schemas, formats, and efforts as background for the design of a simple comments MicroFormat."