title: Good XMPP/Jabber client library for .NET 3.5 (or 4.0)
body: <p>What are some good (or the best!) XMPP/Jabber client libraries for .NET 3.5 or 4.0 development?</p>
  
  <p>I have seen a few decent libraries out there, but most of the good ones seem to be built for Framework 2.0.</p>
  
  <p>(If a Framework 2.0 library is still the best, I'm ok with that.  I'm just looking for the best libraries for a new project built on 3.5 or 4.0).</p>