[Design] email: hiding messages in inbox until X

[Kaitlin Duck Sherwood]

Sometimes you get an email message that you can't deal with right 
away because you need more information.  It might be nice to have a 
simple way to tell Chandler, "Hide this message until X", where X 
might be things like
    + 2 PM on 11 December 2002
    + I get another message from this sender
    + I get a message from winston@flossrecycling.com
    + the database upgrade task is marked as clear
This keeps the task associated with the message out of your way until 
you have the information or resources to deal with it.

It might also be nice to have the ability to hide "to-do" list items until X.