After a long hiatus, release 0.2.2 is out. This is a bugfix release that fixes breakage caused by API changes in recent versions of PyGTK and Numpy.
Release 0.2.1 is out. It's a bugfix release, primarily fixing the GtkBuilder bug that manifests on some systems (particularly Gentoo) but not others.
For the third time in 10 days, mrfilter has another new website. I promise to stick with this one for awhile. It's based on Sphinx, and looks pretty good. See it at http://mrfilter.sourceforge.net .
Mr. Filter has a website and user's manual up now. Their spartan, but to the point.