title: A .Net4 Gem: The ConcurrentDictionary - Tips & Tricks
body: <p>I started to use the new ConcurrentDictionary from .Net4 to implement a simple caching for a threading project.</p>
  
  <p><strong>But I'm wondering what I have to take care of/be careful about when using it?</strong></p>
  
  <p><strong>What have been your experiences using it?</strong></p>