I recently discovered the power of the "Call Web Service" feature. As a result I've tried to find a guide in this forum or on the web and could not, so I decided to just create one. My thought was to add links to how to guides for each one. I didn't spend the time to find guides or how to articles for all of them, but figured I would just post what I have in the hopes that it can help someone else.
Workflow Web Service Guide
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.