So I am about 4 days late with this, so it may not be 'news worthy' anymore, but it appears my friends at CMS Watch have joined forces with some of their other friends to develop an ECM Maturity Model - or - ECM3 for short.
The have put up a blog at http://ecm3.org/
You can download the maturity model itself (a PDF document) here: http://ecmmaturity.files.wordpress.com/2009/02/ec3m-v01_0.pdf
Please note that it is available under a Creative Commons license - nice work guys !
So I am not going to wax lyrical about the document, go download it yourself and have a good read :-)