Lots of great information can be found in the following thread:

http://www.saddoboxing.com/boxingfor...dowboxing.html

This video also has some good advice and tips on shadow boxing:



... my only advice is to make sure you spend a lot of time focusing on shadow boxing. It's a great tool and will greatly help your overall skill. Have a look around the forum there's tons of great information on shadow boxing and the benefits of doing it.