I probably won't be posting too much MathML here, but I wanted to check it was possible. Unfortunately I think blogger always serves as text/html, but Peter Jipsen's script seems to work well in this context. Currently it requires a Gecko browser such as Firefox, or IE with MathPlayer installed. Hopefully I can extend the script to allow some basic CSS rendering in other browsers later.
I also needed to check I could write posts in emacs of course!
Finally some examples using the MathML in HTML script.
[update, continuous Relax NG validation of the mathml in xhtml in atom markup as I type into this emacs buffer. Isn't emacs wonderful. Will post schemas used shortly.]