The Latin Pass deal was creative. I'm having trouble finding threads on it with FT's search engine, but here's a news story that explains it. It focuses on Pudding Guy, who not only did that promo but scored big on the AA/Healthy Choice promo by buying really cheap pudding cups.

http://www.businessweek.com/adsectio...er/thunder.htm

I don't know if this is what you're looking for, but NW and AA both had some good shopping promos - it was like buy from so many of their partners and get a bunch of bonus miles. It was a fun quest to find the cheapest items one could buy from each partner to qualify. You should be able to find those threads by searching in the specific airline forums.

Good luck!