Do you guys know Guy Kawasaki? I've just came across with his presentation about his book The Art of the Start. I do not know about the book but I watched presentation and I am very impressed. This guy is very good at his field.
I give presentations in university in front of about 200 studens and I am interested in improving my presentation skills. His video was full of jokes, self criticism but first of all very usefull information. Although this isn't technical presentation I recommend it because there is very valuable information and a ton of practical information
Of course there are some things I personally disagree but there are some interesting thoughs and advises.
I think I am going to read his book. You can watch the presentation if you are short of time.