Here a a few mvc applications with varying levels of complexity. Checkout Kazi's blog there is some awesome stuff there! Also checkout the ncommon which has repository paterns etc for nhibernate, linq2sql and entity framework, among other goodies.
- kigg from Kazi Manzur Rashid
- sutekishop from Mike Hadlow
- codecampserver from Jeffrey Palermo
- mvcstorefront from Rob Conery
- ncommon from Ritesh Rao
- FubuMvc from Chad Myers, Mark Nijhof, Jeremy Miller etc