These are reviews that I've done for hard leather cases for the nokia n900:
http://www.symbianoasis.com/2010/01/...rotection.html
http://www.symbianoasis.com/2010/01/...rotection.html

both are good, check out the links for pics and more in-depth details.
You could also search this technology news site for some cases, they usually review good one's occasionally..
and if you feel like thanking me, there's a button for that below =)