gleff,
the hottest one I can think of not in this list that has my attention is the Bank One/First Card/United airlines double miles promo, good thru June 30th. This was unusually strong IMO for a couple of reasons:
1) started March 15th, so a loooongish 3.5 months long promo
2) unlike previous years, this one applies to ALL charges, not just targeted ones that appeal to a tiny minority such as food, gas, etc
3) though there was a threshold before double miles begins, it was, at least for me, a very low amount (something like first $150/mo didn't count double off the top of my head)

http://www.flyertalk.com/forum/showt...highlight=bank

There was an initial discussion in the United thread, then it seemed to die away. United is apparently offering a much-more restricted one, that requires purchase of a ticket as well, and this one I refer to is much more broad and less restrictive.

But I have loaded up massive United miles because of this promo. And the nearest United airport, or codeshare, is almost 150 miles away from my home, so accumulating United miles is not my typical goal. But knowing United was strong internationally gives me hope I can catch an international flight somewhere in the future, and since AA dropped the bombshell call Milesaaver, and we all know Citibank has never in their history offered a double Aadvantage mile promo of any significance, my interest in accumulating more AAdvantage miles just died a quick death. Ergo, why not take the double United miles and skip accumulating more AAdvantage miles for these 3.5 months ?