TMI also has advanced manuals on humorous speaking, entertaining speaker. there are 15 advanced manuals following the basic manual which is a good basic speakers education and a leadership manual. Sure beats the cost of a seminar on either of these subjects and is hands or should I say mouth on training.
Just like any other system one gets out what they put into it.
http://www.toastmasters.org/find/default.asp will help find a club in your area and most clubs welcome visitors.
I even do work on my club's website and am in charge of making the agendas and scheduling speakers. Lots to learn.