OS X Leopard’s Quick Look feature is great—select any file(s), jam on the spacebar, and the contents of the file are revealed. This works with Automator as well.
Quick Look an Automator workflow, and a HUD pops up revealing the entire workflow content. In a nice touch, resizing the QL window dynamically scales the content (saving bitmaps). Note that QL only works on Automator 2.0 workflows; older workflows will need to be opened and resaved.