The Ricoh GR Digital is coming out and if that has a housing it could be good - their range of trad. cameras (ie non-digital) are very very good --- or at least were until discontinued... I use the GR1V alot.
Anyway :
http://www.ricohpmmc.com/uk/products...cification.htm
http://www.letsgodigital.org/html/re...amera_EN1.html
http://www.dpreview.com/news/0509/05091301ricoh_gr.asp
I don't have time to read it all but from past experience the little ricohs are good...