Hello,
I have wrote a "google suggest" like service for wikipedia under GPL licence [1]. By the way, I am not sure if this project will interest you, I am open to all comments from your community.
I wrote a simple web site for english/french on http://suggest.speedblue.org, all software are available in the download section.
Best Regards. Julien Lemoine
[1] If you want me to change the licence to something other than GPL, please let me know.