With DVD2one you can make a movie-only or full disk copy of your DVDs for personal use on a single DVD-Recordable.
The video compression engine used by the software is extremely fast and takes only 15-30 minutes (depending on your computer) to process a film so that it fits onto just one DVD. Audio tracks are not re-compressed so that maximum quality is preserved. You can copy the totality of each DVD, with menus and bonus sections, or alternatively choose to copy just the film. Once the process has finished you can then burn the DVD with your usual burning software.
30 day free trial for Mac OS-X 10.3.9 and 10.4. Some functionality is limited.