"Saving Private Ryan" has a mind-blowing audio track. Depending on your copy, you might be able to use it to make sure your receiver recognizes DTS audio. There are two versions of "Saving...." on the market: one with Dolby Digital only, and one with DTS. Both sound great, but the DTS is awesome. (Sometimes it takes a high-end system and proper speaker placement to tell the difference. Otherwise, the DTS track will just sound a little louder.)

If you have a DTS version of a DVD, be sure the DTS track is actually playing. (Assuming your receiver decodes DTS and you have surround sound speakers.) If the DTS track isn't playing, then you might be listening to a 2.0 Dolby Digital track, which is sometimes included for people without surround sound. Such is the case with the DTS "Saving..." DVD. Some DVDs will have 5.1 DTS and 5.1 Dolby Digital on the same disc.

Anyway, most DVDs with the DTS soundtrack will have the red and white "DTS" logo at the top or bottom of the front cover. When in doubt, just look at the back cover for the audio specs. Unfortunately, there is no standard way to list these things, so different studios list features differently. (This doesn't help consumer confusion.)

Here is what the DTS version of "Saving Private Ryan" looks like:
http://images.amazon.com/images/P/B00001ZWUT.01.LZZZZZZZ.jpg

U-571 This is one of those DVDs that has 5.1 DTS and a 5.1 Dolby Digital audio. This would be a good disc to test out your receiver's ability to recognize the DTS track. Just pick the desired audio track in the DVD menu. (Probably under "audio," "set-up," or sometimes "languages." Alternatively, you can sometimes use the "audio" button on the DVD player remote to switch back and forth between audio tracks. This is an easy way to compare DTS versus Dolby digital.

Spiderman No DTS track, but the 5.1 Dolby Digital track is great.

The Patriot The "Superbit" version has a 5.1 DTS track. The more widely available non-Superbit release has Dolby Digital audio.

marxtacy

...really needs to finish the FAQ....