I started a thread in '05 to track the leaders (http://www.flyertalk.com/forum/showthread.php?t=449258) that year. Didn't bother with it this year, but I've maxed out the few meager bonuses they've had this year, plus we buy all of our office supplies from Staples for my company, which adds up. During the back to school promo (4 miles per $1), I think we spent $5K on office supplies. Additionally, my brother buys a boatload of stuff on drugstore.com and uses my AA #. They run 8 mile/$1 spent specials which really add up quickly as well.

eShopping has been very good to me.
When I hit 1MM next year, less than 25% will be BIS miles.