Do you want to use LINQ but you are still stuck with .NET 2.0 and .NET 3.0? Are you still waiting for your company to upgrade to VS 2008 to get a hold of LINQ? Then wait no more because the good guys who wrote the book C# 3.0 In A Nutshell have created a .NET library that implements all the standard LINQ operators so that you can enjoy the goodness of LINQ in .NET 2.0 and 3.0.
LINQBridge is a reimplementation of all the standard query operators in Framework 3.5's Enumerable class. It's designed to work with the C# 3.0 compiler, as used by Visual Studio 2008. LINQBridge comprises a "LINQ to Objects" API for running local queries. (It doesn't include an implementation of LINQ to SQL, nor LINQ to XML; a good compromise can be to force Framework 3.5 out to just the server machines, allowing LINQ to SQL to be used where it's needed most).
LINQBridge also includes Framework 3.5's generic Func and Action delegates, as well as ExtensionAttribute, allowing you to use C# 3.0's extension methods in Framework 2.0.
In fact LINQBridge lets you use nearly all of the features in C# 3.0 with Framework 2.0—including extension methods, lambda functions and query comprehensions. The only feature it does not support is compiling lambdas to expression trees (i.e., Expression<TDelegate>).
Awesome huh?! Get this goodie here: http://www.albahari.com/nutshell/linqbridge.html