The long title almost says it all. Has to be at least $100 purchased with Discover Card at participating malls from August 1 thru September 7, 2008 AND then starts all over in November.
"*Get a $10 Discover® Gift Card when you make $100 in purchases with your Discover Card at a participating mall between 8/1/08–9/7/08, while supplies last. Original receipts and your Discover Card must be presented to a participating mall's Customer Service by 9/7/08. Limit 5 Gift Cards per account, during the promotion period. See Gift Card terms and conditions for full details."
Detailed info here:
http://www.discovercard.com/mallpromo/index.html
Search previous FW threads for the same (or very similar) promo that was from last year for tips and opinions.
Not sure if this belongs in Hot Deals or Finance since not everyone has a Discover card.


