Sous-Vide 101: Prime Steak Primer | Serious Eats
http://www.seriouseats.com/2010/03/how-to-sous-vide-steak.html

The process of vacuum-packing meat and cooking it in a precise temperature-controlled water bath has revolutionized the way fine-dining restaurants are run. This article explains it, but you can do the same using vacuum sealed bags.