Still the king of eating cheaply in Las Vegas. A subscription is well worth the price if you are budget minded and plan on a Las Vegas Trip.

http://www.lasvegasadvisor.com

Also, check out:

http://govegas.about.com/od/cehapeatinginlv/Cheap_Eating_in_Las_Vegas_Cheap_Restaurants_in_Las_Vegas.htm

If you're able to splurge during your trip, Las Vegas has more great restaurants than any other US city, IMO. Be prepared to pay $100 up though, or play at a level where food/drink are comped. Guy Savoy at Caesars Palace was created by the chef with a 3* restaurant in Paris. Tasting menu from $350 per person; more if you want paired wines. You can use Harrahs player points here, as with all other eating venues at Harrahs hotels.