This is a great video Entitled Life after Death by PowerPoint by Don McMillan. It really gets the point across.
I personally think PowerPoint is a good tool if done well. The best PowerPoints use great images and few words.
Here’s a resource I found on the microsoft.com site, “Presenting with PowerPoint. 10 dos and don’ts”. It’s a quick read and provides great advice. Not humorous like Don’s video link but a good reference.