Rhetorics - a good start

I've always been fascinating on how to do a good presentation or how to persuade an audience. My usual way to do this is to study the subject and to get a good feel about it - i know that i am much better on topics i really have a passion for. And then i often spoils the whole thing by taking to much or to fast.

But here are, in Swedish, a very good site for people like me, who might need a brushing in the theoretical way of how to construct a good presentation:
http://www.falkman.se/

Note the guide under "Retoriska Verktyg"