For my Citi AA Platinum MasterCard ($85 annual fee), current card retention promos included:
1. $85 statement credit for 5 purchases of any amount
2. $85 statement credit for $3000 in purchases
3. spend $500, get 3000 AA miles
4. 1 extra AA mile on all purchases for 6 months up to a max of 5000 miles
5. 2 extra AA miles on all purchases for 6 months up to a max of 10000 miles
I'm generally pleased with Citicard service. The annual fee is the big bugaboo for me, so #1 did it for me. I'm keeping the card for another year.