So you have some Autodesk software, you use it and love it. Now, do you want more? Do you have everything that you need? Is there anything missing?
Of course there is.
One great method is to surf the internet for diamonds. There are many users out there who create families, lisp routines, blocks, programs, API, etc. They create these things and then share them with the world via http://www.augi.com/, Autodesk exchange, blogs, ftp, etc.
But in the end, you have to take the first step. You have to go and look for it. Very little in this world will just drop itself on your lap(top). Now fortunately there are users out there who will do some of this work for you, myself included. There are some cool things about to drop...today...keep an eye out.