So, I've been looking at Hadoop with keen interest, and to be honest I'm fascinated, things don't get much cooler.
My only minor issue is I'm a C# developer and it's in Java.
It's not that I don't understand the Java as much as I'm looking for the Hadoop.net or NHadoop or the .NET project that embraces the Google MapReduce approach. Does anyone know of one?
Recently, MySpace released their .NET MapReduce framework, Qizmt, as Open Source, so this is also a potential contender in this space.
You can look into something like RavenDb it provides very decent support for MapReduce for a fairly large size of data. as it is built in .Net so a proper LINQ client API is available.
To get you started you can read my blog entery.
Microsoft Research has project Daytona http://research.microsoft.com/en-us/projects/daytona/
You can download it. There's a WordCount sample in C#.