[crooksey]

Use a whiteboard/pen paper with a webcam, as if you two were in the same room. Just because we have every productivity application available to us, it doesn't mean we have to use them or approach things any differently, half of the time these products are solving problems that don't exist, keep it simple, communicate and get results.

[notduncansmith]

This. No matter how much written material you give this guy, he's not going to read more than 5 pages. So get some Balsamiq mockups, then walk through them on video.