Wonderful program - very fast and easy to use. One thing I'm not sure of is the info section - is it possible to see more of the exif information from the photos (Nikon d50)
Yes, you can completely customize what appears in the Info text pane of the Preview window (and in the Info tooltips in the Contact Sheet.) Just goto Edit->Set Info Text...
You can add any of the numerous variables to the Info Text. Click on the Variables... button. Depending on what OS you are running on, you will either get a floating panel, or a drawer with the variables in it. When you select a variable, the top area will describe the function of the variable. Double-clicking a variable will paste it into the Info Text dialog for you.
HTH,
-Kirk