There's plenty of 1080p material around - several hundred HD-DVD and Blu-Ray discs all of which are 1080p as stored on disc! But Andrew is still right, the additional pixels in such a small screen size will be of little or no benefit at all.
You won't be viewing "at 720p" though, you will be viewing at exactly 1366x768 which is the physical pixel resolution of your panel. 1920 x 1080i (interlaced) frames will be deinterlaced by the TV, then downscaled to 1366x768. This is a very easy downscale, you won't look at the picture and say "hey, there's some pixels missing there"!!!
The tendency to describe things as 720p, 1080i or 1080p I think is only adding to confusion in this already very confusing time for the industry. A signal can be 720p, 1080i etc etc, but a display is exactly what it is 1920x1080, 1280x720, 1366x768, 1024x768, 848x480 etc. We need to consider a little less trying to match signal resolution (e.g. 1080i) to display resolution (e.g. 1366x768), and more focus should be on matching display resolution to the physical size of the display and how far from it you intend to sit. In the world of flat panels, anything 50" or below doesn't *need* to be 1080p at all. Nice if you've got it, and importantly can use it, but in some cases it can be at detriment (poor SD upscaling, small pixels therefore less light output/contrast, overall a worse image).