I am in the process of updating my site to Joomla - an open source content manager system (CMS).  I am very impressed with Joomla for both its power and ease of implementation. 

Coming from a background as a developer in Microsoft shops, I was initially dismissive and apprehensive of open source software development tools such as PHP and MySQL. My initial apprehension of these tools was quickly eliminated as I found them to be not only more reliable than Microsoft tools but also more developer friendly.

I did not have the same initial opinion of Open Source applications and found them both unreliable and difficult to implement and use. Joomla has dispelled my apprehension for Open Source applications. Who needs Microsoft anymore?