Boomerang for Gmail is a really nice product - I recommend trying it if you haven't yet.
It give you a "Send Later" option in email, which helps if you want to write a reply but don't want it to go out yet - for instance, if you want to say "The blog post is live now," but the post won't be live for another three hours.
It's pretty cool. You wouldn't even realize how useful it is until you try it. Check it out.