Jacob Cass, guest author* on Gino Orlandi's design blog You The Designer, has put together a great list of keyboard shortcuts that every designer should be using. Perhaps i'm a bit of a nerd when it comes to these, but i find that they really do save time. Who doesn't want to shave a few minutes off of their work day?
See the list here.
And thanks Jacob!
*as understood from the post. perhaps this post was written by Gino?