Is there a C# MongoDb Driver which supports replica sets?
There's a testing branch of mongodb-csharp with support for Replica Sets.
Links:
http://www.google.com/url?sa=D&q=http://github.com/lanwin/mongodb-csharp/tree/1.6_prep&usg=AFQjCNG9o_wkn2iRW8BaHyr69Ul6Ekfvfg
http://groups.google.com/group/mongodb-csharp/browse_thread/thread/46f55733d6e17a20-