It’s weird that no one has mentioned LINQBridge. This little awesome project is a backport of LINQ (IEnumerable, but without IQueryable) and its dependencies (Func, Action, etc) to .NET 2.0. And:
If your project references LINQBridge
during compilation, then it will bind
to LINQBridge’s query operators; if it
references System.Core during
compilation, then it will bind to
Framework 3.5’s query operators.