Photoshop used to have a cool feature where you could created contact sheets (or index cards) from a set of files on your computer. I use this feature a lot to create a giveaway card when shooting portraits for large groups of people (or Doras).
You needed to run a script called contact sheet from the automate menu, select some settings and TADA! Photoshop would magically create a contact sheet for you.
If you used this feature on previous versions of Photoshop, you may have discovered that it is missing from Photoshop CS5.