Discovered Pages
[Discover] Threading in C# - Part 2 - Basic Synchronization http://www.albahari.com/threading/part2.aspx
(.net tutoriales programacion threadsafety) 
[Discover] Headius: Q/A: What Thread-safe Rails Means http://blog.headius.com/2008/08/qa-what-thread-safe-rails-means.html (rails jruby ruby programming)