Actually Toy Story and Toy Story 2 both have DTS tracks. A lot of the movies that are out there are actually filmed in both DD and DTS.
The real reason why many movies werent released in DTS on DVD is because first generation DVD machines and the receivers people bought to go with them, did have DTS capability. As such, if a customer bought a movie that was released solely in DTS and didnt have the capability they would have no sound. This explains why Blockbuster and Hollywood dont rent just DTS disc. Another reason is that DTS actually doesnt compress as well as DD. This means that it takes more disc space to get the DTS soundtrack then it does the same DD soundtrack, (Dances with wolves is 2 disc in DTS vs. 1 disc in DD, another example is that in early DTS movies there werent as many special features put on the disc because of space requiremetns) As a result, many disc werent put out in DTS. THe funny thing is DTS was actually created before DD, as a format for the next generation of CD's, the system was then seen as an alternative way for surround sound. At this point unless you are buying older technology your machine is capable of both DD and DTS and a good portion of the disc that are released now are offered in both sound formats.
In case you havent figured this out yet, most systems are set up to default in DD, since it is the minimum that most people have. You have to go through your audio setup in up to three places to get everything in sync. First, you always want your receiver set up in automatic detection mode. This means that it will switch to either DD or DTS, depending on which ever signal is being transfered. Second, you have to have your DVD player set up so that it knows it has a DTS capable receiver. Finally, you need to go through the audio selection and choose DTS on the disc itself.
For a listing of DTS movies go to
www.dts.com and they list most of the movies that are being released on DVD with DTS. WHen you are watching movie previews you can tell if it is going to be released in DTS by the final credits in the moniker or the ad. It will usually be at the very bottom.
Lastly, watch out for movies which are released multiple times. A good example of this is Twister. First generation didnt have DTS although it was actually in our first DTS demo disc. The second generation did have it, so when you find movies sometimes you will happen upon an older copy.