Little info I found online.

Unless you are into video editing, or extreme graphic computer use, 1080p does hardly anything at all except hit you in the pocket book! It took years of pressure for broadcasters to finally produce 1080i or 720p and there are NO plans to pump out 1080p on cable, satellite, or broadcast. There is ONE DVD format that puts out a 1080p signal and that is Blu Ray. Blu Ray, is a great DVD technology and the picture quality is awesome, however it's no better than 1080i or 720p in my opinion. I base this opinion on some pretty thorough testing. Recently, our staff reviewed a 65" Panasonic 1080p plasma, a 52" Sharp 1080p LCD and a Sony 46" 1080p LCD TV. We viewed several movies via the Sony Blu Ray player which conveniently has a resolution toggle button on the remote control. In order to perform a fair test of 1080i vs. 1080p we sent participants out of the room after having shown them the DVDs with both resolutions several times. Then we called them back in with one of the resolutions displaying and asked them whether it was the 1080p or 1080i signal. We repeated this process 10 times and, guess what? They had no clue and could not differentiate at all between the two. This feedback came from a team who knows TVs. In fact they seemed to favor the 1080i signal slightly (60/40). It's incredibly difficult to see the difference even in a side by side test.