I’m working on getting xml-rpc.el working with the CVS version of w3.el. We will then be able to use blogger.el in emacs21. It isn’t going to be as difficult as I thought, though I am trying to decide exactly how to do it. Should the functionality be in two different libraries, or should it be in one library that figures out which w3.el it is running with? Either is possible, but I think from the user end dynamically determining which is which is better.