Using the dynamic query library is pretty simple and easy to use, and is particularly useful in scenarios where queries are completely dynamic and you want to provide end user UI to help build them.

In a future blog post I'll delve further into building dynamic LINQ queries, and discuss other approaches you can use to structure your code using type-safe predicate methods (Joseph and Ben Albahari, authors of the excellent C# 3.0 In a Nutshell book, have a good post on this already here).