Todd has added to our existing couple of screen casts with a great look into what you can do with your application definition file once BDC Meta Man has created it. He goes over importing the application definition file and using all the out of the box web parts:
http://www.bdcmetaman.com/Information/How%20to%20import%20App%20Defs%20and%20configure%20BDC%20List%20and%20Actions%20Web%20Parts.wmv
If you'd like to see screen casts on any other BDC area let us know and we'll get them recorded!