I just finished reviewing the November entries in the TechNet Wiki Guru competition and was quite impressed with the submission from Visakh Murukesan who submitted an article titled “Random SSRS Musings 2 : Simulating NOT IN and NOT LIKE Functionality In SSRS Filter Expressions”.  I found this to be a well written post with excellent examples.  These are both excellent examples of how simple expressions can be used to extend the capabilities of reporting features.