St. Clair Software has just released version 4.0 of its well-known Default Folder X for both Leopard and Tiger. This utility enhances OS X's Open and Save dialogs in a number of ways, allowing easy access to favorites and Spotlight comments, defining a per-application default folder, integrating with open Finder windows and more. The new version revamps the interface with a more HUD-like Leopard look and offers support for Quick Look as you can see above. Last week Macworld posted a preview video that does a good job of explaining just what makes Default Folder X so handy.
Default Folder X is $34.95 and a demo is available. The upgrade is free to registered users of version 3 who purchased after June 1, 2007. The upgrade cost for other OS X registered users is $14.95 (and $19.95 for OS 9 registered users).