I know there is already a post about the Express Lane Bonus buried in the "Share iDine Bonuses" thread, but I want to point out that it is targeted to anyone with an HHonors Amex—and not only for people who received the promo email.

If you have an HHonors Amex but did not receive the promo invitation, you can sign up by logging onto the Amex website. You will find a registration link for the promo at the bottom of the Account Summary page.

The promo gives your triple points for 30 days. You must register by 30 September.