Skitch as part of your work flow
In case you still haven’t heard, the guys from Plasq have developed the coolest screen snapshot software ever created for Mac. It’s called Skitch (check it out). What Skitch does is let you take snapshots of your entire screen, or portions of it, and then lets you add extra information to the picture.
One of the greatest features is that every picture you take with Skitch is saved in the app’s history. So looking back to the pictures you’ve used is really easy. You can also just use Skitch to keep a handy storage of thing you take snapshots of, and not worry about where the heck you saved them in.

Skitch’s Image History
It’s almost impossible not to integrate Skitch to your ordinary work flow immediately. Give it a try.