Hi Scott,
I use these units to store my DVD's:
Discgear.com - Selector 100
So 100 DVD's in a space that is 38 x 16 x 16 cm approx.
The original DVD cases have gone to the loft.
I then use this software:
Invelos Software's DVD Profiler - DVD Collection Software for the DVD and Blu-ray Enthusiast
To keep record of my collection. Each box is number A, B etc.
So if you want a movie, you check on DVD Profiler for the type of movie or any criteria and select the movie you want. On the profiler software I have an item under personal information that allows me to put the disc location ie C22.
I have found this the best system for keeping movies in one location with minimum space. This also allows others to borrow my movies.
Apart from this I am currently putting my entire collection on a NAS drive which is connected to a router. Also connected to the router is my PS3. This then allows me to play a movie without the DVD. You can find more on this elsewhere in the forum.
Hope that helps.
Best regards
Chris