This offer is crazy, you will get 9999 miles for just 1 day rental at Avis or Budget, you have to book via Delta website, a link from offer page. Do not add any BCD number or AWD number on ur own.
Although it looks like you need to book a flight in order to get this offer, it has nothing to do with flight booking. Offer is valid until Aug 1st, 2008 only, so act quickly.
There is also another offer will give you 5000 miles for regardless of rental length until Dec 31st, 2008, but you need rent Budget "where2" GPS in order to qualify, which cost you additional $13.95 per day. I have posted here about rental car deal for more than 1 day, so the 5000 miles GPS offer is only worth for 1 day consider the cost of GPS. Here is the detail
With that 9999 deal, an intra asia Business class award ticket only costs me less than $80+ some fees when I redeem my miles. Not bad!