$665 of airfare with Citi credit card sign-up

(expires July 15)

Citibank offers 50,000 Thank You points for signing up for their Citi ThankYou Premier credit card.  While I value ThankYou points at a slight discount to 1 cent per point, this credit card has the key benefit of increasing the value of ThankYou points by 33% when you book airfare at the ThankYou.com website, which has airfares comparable to sites such as Expedia.  So the 50,000 point bonus you will earn after spending $2000 on the card will get you back $665 worth of air travel.  ThankYou points do expire after 3 years, though you can redeem them for $500 worth of gift cards at places such as Best Buy, Home Depot, and others.  The annual fee is $125, though, so factor that into your ROI calculations.