Mac Twitter apps with ability to schedule future tweets?

[macdot]

I've been looking around and can't find any, but does anyone know of a Mac Twitter app that allows you to schedule tweets at a future date?

 

[GoCubsGo]

Future tweets? Isn't twitter or the purpose of twitter to "tweet" whatever the heck is going on in your uber exciting life?

Future tweets seem rather silly. Buy hey, if you're going to tweet may as well stock pile thoughts.

Oh and no, I don't know of one.