Video Encoder that is only 87 MB, and installs quickly on Mac OS X 10.4 or higher.
To use, just open the dialog box and click "add" to bring up the Mac's Finder menu.
The Encoder can convert multiple files at once from several different formats, including .avi, .mov, and mp4. Click encode, and that's all there is to it.
A status bar in dialog box will keep you posted on the encoding progress and let you know when your files are ready.