[Orgmode] State excluded in agenda

[Wanrong Lin]

Hi,

I have a "CANCELED" TODO state. When I change a scheduled item to this 
state, I do not want it to show up in the agenda. I still want to keep 
the original scheduled date or deadline though just in case later I need 
to activate it again. I can do some tricks like turning the 
schedule/deadline time stamp into an inactive one. But I think it would 
be neater if we can have a list of TODO states that will be excluded 
from the agenda view. Right now the "DONE" state seems to be the only 
one excluded.

Maybe there is already something like that and I just did not find it? 
Any comments? Thank you.

Wanrong