Hoping to follow some of the success of svg-developers, xbl-developers, a list on XML Binding Language(s) has been started:

XBL, or XML Binding Language(s). An XML language for coding-shortcuts to more Model-View-Controller separation in building visualisations in for example XHTML or SVG. This is a mailing list and web forum for anyone who is (interested in) developing something that uses XBL technology.

Primarily it is meant as a learning and helping experience for beginner to expert developers, no matter which of the similar, but different 'flavours' of XBL you're targeting.

Secondarily, it might also give writers and implementors of those different XBL specifications useful feedback on use cases, misinterpretations, valuable examples, missing documentation, etc.

Because often "whatever works for me now" is what counts this list is meant to be a valuable adddition to what is already on the web for the specific XBL flavours.