Yes they do.
Beans go stale about two weeks after roasting.
Grounds go stale about twenty minutes after grinding.
(rnuk http://flickr.com/rnuk, Tue 12 May 2009, 16:18, archived)

Well I never.

( LimeyTreat Bitch. Lover. Child. Mother. Sinner. Saint., Tue 12 May 2009, 16:20, archived)

*breathes in*
The refrigerator is the mortal enemy of your coffee. Taking coffee in and out of the fridge is a sure way to suck the flavor right out of it. Coffee that will be used frequently and immediately—whole bean or ground— is ideally stored in an air tight, opaque,and glass or otherwise inert container. Coffee that will not be consumed immediately but needs to be preserved for near-future use can be safely stored in the freezer assuming it is stored in a dry and air tight container. Storing an unsealed container of grounds or beans in the cold temperatures of either the fridge or freezer is a sure way to accelerate the its journey from delicious flavor to stale bitterness
(rnuk http://flickr.com/rnuk, Tue 12 May 2009, 16:23, archived)

I like that coffee and milk dust that you just add water to.

( Undulating Tentacles of Love getting fun down to acceptable levels, Tue 12 May 2009, 16:29, archived)

I only read your post and thought
you were talking about baked beans. Makes more sense now I've read the other posts you were replying to.
( Jobe, Tue 12 May 2009, 16:20, archived)