So, there are
as C# drivers for MongoDB available.
Which one of them is the most m
The mongodb-csharp driver is about to make a huge push regarding support for typedcollections which will include full Linq support. I think you'll find that it is easy to work.
The other 2 projects are also steaming ahead. If you want .NET 4.0 support, simple-mongodb would be your best bet.
NoRM has a whole bunch of committers who are all great coders, so no problem with it except it doesn't have an official release.