remember to future proof the instal, i.e, run the cables you think you may use in the fututre.
You may not have an sky hd box for example right now, but run an hdmi cable(or 2 ) in case you decide to get it in the future, should make life that much easier if the cables are plastered into the wall in trunking.
If you have a laptop, you may want to run in a vga cable incase you want to view it on the tv, or if you smash the screen by accident, you can still use it.