In the past I have read multiple books about creating and giving presentations. I really like to present something to the public. On numerous NLJug events I have presented as well as a lot of internal events @ trifork.
These books have helped me to improve my presentation skills as well as the process to come up with nice presentations.
If you are also interested in these kind of books and you do not mind that I earn a few bucks you can buy these books that I highly recommend @ Amazon.