Interesting libraries based on LINQ
Every man and his dog seems to be adding an implementation of LINQ to something.
But I'm wondering about other more niche LINQ to projects or implementation that are out there that we should know about.
Check out Reactive Extensions, which uses LINQ to define and manipulate asynchronous processing workflows as if they were observable collections.
Linq to Lucene. Lucene is the open source Java Full Text Search (Ported to .Net called Lucene.NET) library and has its own querying syntax. Perfect fit for Linq.