Check out these great links to my new favorite hobby hand embroidery
Here is a link to a site that has how tos on just about every fabric: http://www.emblibrary.com/el/elprojects/holder.aspx?page=techniques
Here is also another site with some useful techniques for tracing or iron on. http://www.needlenthread.com/2008/09/tips-and-tricks-for-hand-embroidery.html
I have been creating my own designs, too, and offering them at my customgraphics.etsy.com shop to share with folks also enthusiastic about hand embroidery. A lot of designs out there are too old school, and for making patches they are the pits.