iDVD 4 and 5 can be tricked into supporting an external drive, iDVD 6 supports them stock (as long as they are supported by the OS,) but I don't believe ANYTHING can trick iDVD 3 or earlier into working with an external drive.
And... It may be a violation of the license to run iDVD 3 on a system that did not ship with a SuperDrive. (Looking back, it appears that iDVD 3 only shipped on computers with SuperDrives, and was not available separately.)
However, if you have a computer with an internal SuperDrive that came with iDVD 3, but you would rather use a newer/faster/better external one...
And a quick search (this might be considered promoting violation of a license, so I won't link, you'll have to figure out the search on your own,) does have one person claiming that he got iDVD 3.0.1 to burn to an external Pioneer DVD drive on his 667 MHz TiBook running OS 10.2.8.
On an off-topic note, in my searching, I discovered that the page for the 'original' iLife is still live on Apple's website! http://www.apple.com/lae/ilife/. While apple.com/lae just mirrors the current page, trying the various pages that should be there results in seeing the pages as they were in late 2003. (Or early 2003, in the case of iLife.)
I want to install an internal Superdrive on a G4 that did not come with it. I don't know if there is something more to the factory installation that would keep my Superdrive installation from working (such as BIOS). I have an iDVD original install CD that I just purchased.
Ah, well, there you go, then! If it is both: installed internally, and a model that Apple originally shipped (Pioneers exclusively early on,) then iDVD 3 should support it internally.
If not, then you can try creating two empty files named 'Hurz' and 'Phurz' and put them in your home directory (the root of your home directory, not in any of the subfolders like Library, Documents, or Movies...) THEN, hold down Option while clicking the 'Burn' button in iDVD. That should allow iDVD to burn to SOME officially-unsupported-but-work-anyway burners.
You can also use the 'Hurz' and 'Phurz' trick to "burn" to a .iso file, copy that file to another machine with a DVD burner, and burn it there. I was able to burn the iso's just fine from my linux computer.
Does anyone here know where I can find instructions on how to dis-assemble a 15" PowerBook G4 (1.33 Mhz) to install a new SuperDrive? My girlfriend's PB got stepped on, and now the drive is acting funny. Thanks!