Restaurant.com which sell discount dinning certificates has a 60% off coupon currently.
The code for 60% off is 45665.
New and notable to the list are Alize, Andre's at monte Carlo, and
Tremezzo. Kahunaville was added earlier. (Some of the best locations are sold out or haven't had their certificates available yet.)
You can search the list by area, Las Vegas has a bunch of different zones.
http://www.restaurant.com/