I was cleaning out my e-mail inbox and found this from Lisa, sent on May 13, 2010. Maybe the phone number at the bottom will help those who still don't have their points:

"25,000 AMX Membership Points for your cruise

We found a promotion for 25,000 American Express Membership Rewards points that was being offered for select Regent cruises if the cruise was paid for with an American Express credit card that was enrolled in the Membership Rewards program at the time of booking. Your cruise was one of the qualifying voyage dates and this promotional amenity has been applied to your booking (see attached Regent invoice). The points are supposed to be posted to your Membership Rewards Account 8 to 10 weeks after the cruise.

Qualifying Cards and Payment Rules

Unlike the AMX Platinum program benefits where you can charge with any AMX card as long as you own an AMX Platinum card this promotion requires all payments must be directly on an AMX Membership Reward Card. These cards are listed below and/or link here American Express Membership Rewards Cards:

Platinum Card®
Premier Rewards Gold Card
American Express®Green Card
American Express®Gold Card
ZYNC from American ExpressSM

Brown and Keene added this promotion to ALL qualifying cruises paid for by any AMX card.

Brown and Keene had many bookings on qualifying cruises that have AMX cards on file but we have no idea what type of AMX cards have been used. By adding the promotion to every booking paid for with an AMX card, we ensure that the promotion is on record for those people who actually do have qualifying cards and it also covers those that had a qualifying AMX card when they made the booking but used another AMX card that doesn’t qualify and wish to change the card they are using for payment to receive the promotion.

Even though this promotion is reflected on your Regent invoice, if you have a non-qualifying AMX card the membership points WILL NOT be applied by AMX.

If your card qualifies and the points do not post to your Membership Rewards account, you will need to contact American Express directly as they will not release information to us regarding your credit card or rewards account. As noted above, this is only for American Express Rewards cards only. The American Express contact information provided for this promotion was 800-EXP-EARN Bonus ID: 6469 Offer Code: CAMX MR25 http://www.membershiprewards.com"