Google Docs and Florence
Okay, call me a little behind the times, but I only just started learning Google Docs recently. What is amazing is how easy it is to embed video (from youtube or your desktop, but no where else) and pictures, etc. You can also easily link to outside sources. There are a bazillion templates for a PowerPoint and it can be shared with others online and you can download. Above is a very simple example that I did in one minute. Here is a video I made on how to make a Google Doc Presentation.