QTAmateur does full-screen playback, batch exporting, more
QTAmateur brings a lot of the handy QuickTime Pro features to the table without having to pay the $30 upgrade. Full screen video playback (with a more streamlined, iTunes 7-like video window) and batch exporting of any format QuickTime can read and write make for a handy little app.
QTAmateur is free, Universal and available from Mike Ash, a Rogue Amoeba programmer.