title: What is the big deal with IQueryable?
body: <p>I've seen a lot of people talking about <code>IQueryable</code> and I haven't quite picked up on what all the buzz is about. I always work with generic <code>List</code>'s and find they are very rich in the way you can "query" them and work with them, even run LINQ queries against them. </p>
  
  <p>I'm wondering if there is a good reason to start considering a different default collection in my projects.</p>