I'm working on addressing this as well. I'll be putting a call into the national BMW brake expert, Dave Zeckhausen.

http://www.zeckhausen.com/bmw_products.htm

I put the Axxis pads he sold me on my 2005 4.4i, and on all my M3s over the years. He doesn't have anything listed on his site for the E70 yet, but he's worth a phone call.

This is on my list after the aero kit, 20" wheels and running boards. So probably sometime in late summer.