1. WDTV Live/Media Computer from NAS to TV Screen
2. Netflix/VUDU/UltraViolet/Hulu from XBox/Roku/SmartTV to TV Screen
3. Cable to a TV screen
4. Blu-Ray to a TV Screen
5. DVD to TV screen
6. Movie Theater (I just like the experience)
7. Drive-in (Ditto)
My reasonings are:
For 1,2,&3 - It's convenient. Don't have to put anything in. Though they go from least DRM to most
For 4 - 3D Movies. Can't do that other than Blu-Ray right now
For 5 - You'd have to see my DVD collection. And I haven't put them all on my server so far... still not enough disk space at 6 TB for all of them.
For 6 & 7 - the experience. The Drive-in is actually better (cost and experience wise) in the fall, allergies and such keep me away in the spring and summer. But nothing beats that screen... IMAX especially.