GW sure is giving statistics fans a lot of material to work with these days.
Evidently Games Workshop is testing the water on PDF versions of their army books for the iPad (see here for the thread). So far they only have a PDF version of the space marine codex, which is available through iTunes for 25 pounds. It appears to be at least somewhat interactive, is in color, and is a full version of the hard copy of the army book.
Please take a moment to answer the poll above.
I'm trying to gather information on the ideal price point for such a product, so please answer as though you own an Apple device capable of downloading the PDF.