I think collective.formcriteria 0.9.5 is in an acceptable beta state. I'm reasonable sure that I'm done makeing backwards incompatible changes so it's time to invite y'all to start hammering at it. Add it to your eggs, your ZCML, and install it in your site and have at it. Report bugs to me via email. I'm also interested in any CSS anyone can contribute to improve the portlet appearance.
If you're wondering what it does, it allows collections and their criteria to be used to generate search forms and search form portlets. It also includes a handful of useful collection views. Many have found it useful and I hope yet more will. :)
Thanks to Oxfam America, Jazkarta, and another client for sponsoring portions of the work!