Have you guys seen this Salad in a Jar site? I have to say this is brilliant. Paula writes about how she preps a week or two worth of lettuce and seals them in individual jars. Then she has no excuse not to eat a fresh salad for lunch everyday. She vacuum seals her jars. I have read elsewhere that sealing the jars is not necessary. Stored salad in unsealed jars lasts a long time as well, just not as long as the sealed jars.
Have you tried storing salad in jars?