A couple of things…

First I'd like to say this program is amazing. I use it constantly and would be lost without it.

There is a bug and a couple of feature requests.

Bug: OS X 10.5 (9A527) full screen only shows white screen. Images do not display.

Feature Requests:

1. Option to traverse folders. I have a lot of images nested in folders and it's a pain in the nether regions to open each folder individually to display the images.
2. Hide the mouse curser when in full screen while the mouse isn't moving. Nothing bugs me more than to view full screen images and have the mouse in the middle of the screen interrupting the view. Kind of defeats the purpose of full screen in my mind.

which brings me to…

3. Hud window toolbar in full screen and controller similar to quicktime's full screen controller. I imagine that the hud would appear and give the user rotating, image stepping, image copying and moving etc.