There are three variables here:

how the DVD is authored
how the DVD player handles different SD aspect ratios
how the display device handles different SD aspect ratios

In other words, no matter how you author the DVD, you may still have 'issues', 
depending on the playback components.

As Buck noted, a DVD disk itself can easily have for 4;3 and 16:9 anamorphic, 
as long as the two are confined to separate title-sets or tracks. But your 
projection setup may be able to handle the switch from on to the other 
automatically, or maybe not. (In fact, your disc created with Encore may even 
be fine, if you have the right settings selected in the the setups menus for 
the DVD player, and the display. it also sometimes matters whether the DVD 
player is connected to the display via analog cables (Component, S-Video) or 
digital (DVI, HDMI).

As Jason suggests, you can make a DVD that will play back without having to 
switch aspect ratios regardless of other factors by changing the aspect ratios 
of some of your material: either putting the whole thing in 16:9 (thus 
pillarboxing the 4:3 parts) or putting the whole thing in 4:3 (thus 
letterboxing the 16:9 parts). Alas, either of these will only fill the usable 
part of the screen if they match the native aspect-ratio of the display.

(Video projectors out-in-the-world these days are pretty much evenly split 
between 16:9 and 4:3...)

So, there's no one-disk-fits-all answer. If you're making this DVD for a 
specific venue, find out what the native aspect ratio of the projector is, and 
use that as your base. If this is something you're traveling with to different 
venues, burn one each of the 3 types of DVDs described above: 
1 all in 16:9 with the 4:3 pillarboxed inside
1 all in 4:3 with the 16:9 letterboxed inside
1 with each piece in its own title/track linked with jumps 

Like Buck, I only know how to do this is DVDSP, but there has to be a way to do 
it in some windows software, probably Encore, and probably in Unix as well. I 
think DVDAuthor can do just about everything, but it's basically an 
intimidating command-line app, and the various GUI front-ends all have limits.

Then, whatever type of projection setup you encounter, you'll have an optimum 
DVD for it. (A system that adjusts the aspect ration on the fly from a DVD with 
mixed title-sets is ideal, because then you are always using the full 
resolution of the 720x480 raster. With any pillarboxing or letter boxing, 
you're effectively dropping the amount of information in the image.)

---

If you're brave enough to run ubuntu on PC hardware, you should see if your 
hardware can run any version of OSx86 (Hackintosh). It wouldn't have to be the 
latest and greatest, any version of 10.5 or 10.6 would let you run some version 
of FCP and DVDSP, thus getting you out of Adobeland. You'd install the Mac OS 
on a separate hard drive (USB externals work if you have a laptop) and then 
boot into the BIOS to switch boot drives to switch from one OS to another. 
http://wiki.osx86project.org/wiki/index.php/Main_Page
http://www.tonymacx86.com/wiki/index.php/Main_Page
http://www.insanelymac.com/forum/
http://www.osx86.net/
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