Probably the most usfull app I have come across in a while.
Gmote
http://www.gmote.org/index
Install Gmote on Droid
https://play.google.com/store/search?q=gmote
Install Gmote server on your PC/Laptop/Media centre
http://www.gmote.org/server
Configure (takes a minute)
Run on your Droid
Take control with remote control, full keyboard/mouse
Allows you to control PC/Laptop/Media centre (fully) & along with the right video player app (MX or VPlayer et-al) stream media to your android device.
Stonkingly good app & well worth a donate!