I decided to screencast last night's grok talk as the format seems perfect for a screencast. This one is an explanation of why Dependency Injection is not the same as Inversion of Control and you should not use the two terms inter-changeably. You can view the screencast below (you can use right most icon on the control to make the player full screen if you can't make out the code sample)
Video: IoC is not Dependency Injection
or download it from my Skydrive account using the link below.