Have you ever wondered why once you’ve clicked on “view as thumbnails” you can see little thumbnails of image files but not .psd (photoshop) files?  Well I have, and after doing some research I found out that it is no longer supported.  It use to be before CS came out but I found a solution to your worries.

Thumbview is a program that makes this possible again!  If you are like me, and want to see your .psds as thumbs, go check it out.