Default Folder X, one of my favorite must have utility add-ons for OS X has been updated to version 4.2.1
It's a free update and includes a killer new feature by showing file previews in it's menus. If you hover over the item, it increases in size for a better look. This update also includes various other features, but most are under the hood. Visit their site for the full listing.
Check out the screencast showing off the new feature.