Update: This promotion has expired.
According to my sources, the American Express 25,000 Membership Reward points offer  was recently extended an additional week and is set to expire on October
8th 15th, 2007 (they extended it by another week) so if you were contemplating this offer, I’d jump on it as soon as possible. Will AMEX extend it again? (they’ve done it once already but no guarantees) No one knows yet but the tentative end date of the offer appears to be Oct. 8th 15th. If you want to read up on what the requirements of this offer and what it includes (it’s 25,000 Membership Rewards points exchangeable for a domestic airline ticket), I did an writeup of the AMEX promotional offer .