[quote name='Zoglog']the is 1080p worth it isn't really a good question.
1080p means that it can support 1920x1080 resolution as opposed to 720p sets which are typically 1280x720 or 1366x768. Either way as the lines between TVs and monitors are continued to blur and content is all digital there is no reason to dismiss 1080p just because the 360 doesn't support it.
theoretically 1080p has been worth it for a long time and even more so with the HD-DVD player with the 360.[/QUOTE]
The biggest downside is a lot of really good 1080p sets can't even use the HD-DVD Add-on at 1080p though. Contrary to Major Nelson and other MS PR hacks, only around half of 1080p TVs use a full 1080p resolution in the VGA inputs, even fewer use it via component (HD-DVD can't even use componenet for 1080p anways). Take the Sharp 62U series, very good 1080p sets from what I've heard, however the Hd-DVD add-on will not work in 1080p on it.
That said, my understanding has always been that on almost all newer panels there are deinterlacers that essentially make all interlaced signals progressive (that being the nature of things like LCD). So that makes virutually impossble to tell any difference between interlaced or progessive, so 1080i is for all intensive purposes 1080p (if the signal sent is actually 1920x1080 resolution that is).