At most of the conferences we attend, presenters feel compelled to use PowerPoint as part of their presentations. But the truth is that PowerPoint isn't really improving most of the sessions. It's not making the presentation more compelling, or helping the audience understand information any better. If anything, it's sometimes even more confusing to see a list of ten complicated bullet points up on a screen than it would have been if the presenter just explained the most important idea she's trying to communicate.
I'm a big fan of Seth Godin, and he's got a helpful guideline, for free, that made me rethink how I use PowerPoint, and even made me reconsider whether to use it at all. If you'd like to use PowerPoint to make your presentations even more memorable, it might be worth a read.