You are correct Queefee. It is using PC's. It's actually quite easy to setup with a little patience.
I have movies that are ripped at 720P and 1080P.Both look great playing back off hard drive. The quality is as good as using a single disc player, if not better in some cases.
Using programs like MakeMKV to rip DVDs and Blurays with codecs such as FFDshow available. You can have your high quality sound and picture streamed where ever you want.
As far as content info for movies, I've seen no DVD player than can match Windows 7 media player using the Media Browser plugin or XBMC media player hub software. All of which is free.
Both are feature rich allowing you to customize your Media center to your liking! You get actor info, movie synopsis, Fan-art Poster displays all at the push of a button.
To increase the home-theater feel. You can have HiDef Itunes trailers to play at the beginning of the movies before they start!
Just like if you were sitting in a local theater.
You can categorize or search your collection by alphabet, genre,actor,year,director and even by the production company that released the movie. I'm sure I left out a few. The options seem endless once you take a close look.lol
Here's a few links that can open up a serious can of worms!Media Browser XBMC
You can find a huge amount of info on this stuff over at the Avsforum. Just go to the Hometheater PC section.