Finally got my very own Xbox LIVE Diamond card in the mail this week. I think I registered for this thing like a year ago... better late than never I guess...
After getting the card, you can go on-line at www.xboxlivediamond.com and login with your gamertag. They have specials on irobots (damn you are a lazy ***), The Gatsby Mansion in lovely Victoria, British Columbia, specials at "Hot Dog on a Stick" (wtf!!!), and of course FTD.com - to make good with your little lady... Appears that Microsoft isn't very selective as there are quite a few random companies offering members discounts...
If you haven't signed up, head over to www.xbox.com and get become a fellow diamond card member!!! The Diamond Card is a US-only program and, therefore, open to those Xbox Live subscribers with a US mailing address.
On a side note, today is the last day to pre-order Rockstar Table Tennis for $36 bones shipped w/ no tax. Use the OverStock 8% off coupon listed here