Continuing to explore, I made a copy of one (in the ObjectiveC folder) called "EnhancedDataBurn.pbproj," opened it in Xcode, and on a lark clicked the "Build and run active executable" button. After the program finished its work, an application for burning data to disk came to the front. After trying it to see if it worked, I closed Xcode. The application had indeed been built, despite what looked like an error on the Xcode window (not to mention other errors -- I don't have the slightest idea what any of them mean). A "Build" folder with the application inside of it had been created in the folder "EnhancedDataBurn."
There are a few different examples that can be built and used in this folder, including erase, verification, and audio burn apps. I have Toast, so I haven't thoroughly tested all of them, but EnhancedDataBurn does seem to bypass the Finder's copy-to-disk wait and allows for a few different ISO creation options, and the audio burn app allows positioning of tracks. The Erase app is a quick way to erase RW's without hitting Disk Utility, and EnhancedDataBurn can erase disks as well. The apps have been really handy at work -- a lot faster and easier than trying to explain how to use Disk Utility to people who don't spend quite as much time at their Mac as I do.
If you have Xcode Tools, navigate to the "Examples" folder, where you'll find, with some exploring, the necessary .pbproj files. There's a few others in there that are worth checking out, including an archiving app.
[robg adds: The example applications in the Developer Tools can be very useful, even to non-programmers. In most cases, you should be able to just open the .pbproj files and click the "Build and Run" button to create executable code (which you can then move to your normal Applications or Utilities folder). If you don't have the Dev Tools, you can download them from Apple with a free online-only developer account -- start here...]

