When to use "using" (To dispose or not to dispose - that is the question)

Hey! SharePoint developers! a must read, must print article for us. make sure you read, understand and comply or you will leak!
Seriously - this is one of the most important articles you can read if you are developing for SharePoint.
Roger Lamb's SharePoint Developer Blog - SharePoint 2007 and WSS 3.0 Dispose Patterns by Example