PowerPoint

Here's some presentation tips for everyone:

• If you have more than 2 ideas on your slide, you don't have enough slides.
• Look at the audience, not your slides, at least occasionally.
• Don't derive equations during a talk; refer to the paper.
• The most effective talk's I've ever attended had nothing but pictures on their slides. When you don't have words, you don't end up using your slides as notecards, and talk to the audience instead of reading to them. PowerPoint's bias towards bulleted lists (like, uh, this blog) is a black mark against one of Microsoft's most usable programs.
• If you can't converse in English, perhaps you should bring some backup if you're expected to answer questions.
  

Most of this stuff is taught in virtually any public speaking class (or should be evident to anyone who's sat through 2 or 3 presentations), but in academic conferences, it occurs time and time again.