I just finished the foundations book yesterday. It was a pretty good book, and did give a good foundation of knowledge. I created a process almost like you are looking to do in BT 2004 using the Unleashed book. If you use the foundations book in combination with the Recipes book, you should be able to do what you are looking to do. All you will have to do is use the Recipes book to accomplish the HTTP receipt, then build the Application like in the foundation book.
I plan to have one of my guys who is brand new to BizTalk use the foundations book to create a sort of checklist when they are starting new projects, but that has not happened yet. I think it will be good for them when they are starting out new projects while learning so that they do not forget a step, and cannot figure out why their Application is not working.
Good luck