Nutshell makes cases
One of your members forwarded us this thread.
We make cases for mobiles in New Zealand, and while we do not have a specific folio for the iPad and a paper pad/notepad etc...if there was enough interest from folk here we could craft one to meet your exact requirements.
Our initial thoughts would have you attach the iPad to the inside of a leather wrapped folio on one side using a micro-fine hook'n'loop arrangement (an advance on the old Velcro) and carry a pad plus cards etc on the other side.
There are three options you should look at:
1. Levenger makes a product, ~$79, called the Circa iPadŽ Foldover Notebook
2. Moleskin also makes a product (for iPad 1 only, I think), called the MoleskineŽ Digital Folio for iPadŽ
3. Booqpad makes a product called the "Booq Apple iPad 2/3 Booqpad Leather Case"