PowerPoint: The Good Part
Liz Losh, who blogs about digital rhetoric, makes a good point about the value of PowerPoint and the like for presentations by people who are disabled, describing a presentation by Stephen Hawking. It's easy to be critical of bad PowerPoint, and it's easy to fall into bad presentation habits. But, used well, PowerPoint and Keynote can be effective ornaments to a talk, and they're invaluable to speakers whose voice is limited, or when language or logistics interfere with the audience's hearing or understanding the speaker.