Chirper is the first open-source non trivial web application example with .NET/NoSql integration. Chirper implements a simple twitter clone that, unlike twitter :P, uses Cassandra as its only database. It would’ve been probably cooler to code Chirper it in Ruby or in Python but, unfortunately, this is already done.
Chirper’s front-end is written in C# / Asp.net MVC 2.0. The back-end is based on Cassandra using the Aquiles library. The source code is freely available under the terms of the Apache License, Version 2.0.