I know I'm gonna sound like a moron to the elitists here, but I wanted to make 100% sure; is the ripple on the edge of the screen on a DVD always due to excessive edge enhancement? I have noticed this a LOT on a wide array of DVD's that I've watched over the past year and a half since I swapped up to a 720P projector on a large screen.

I've not heard of edge enhancement causing your phenomenon. That sounds more like something w/ how your projector is set up. I don't own a projector, but it sounds like you have no overscan set and you're right at the end of the picture. Setup DVDs like Video Essentials have screens that show how much overscan is set on your TV. If you were to take a look at it I'm guessing you'd see it say 0% (or conversly 100% - I don't remember which way it goes). Most movies are designed to allow for some overscan, 2-3% I think, which eliminates artifacts at the edges such as what you are seeing.

The question is if you are able to get into a setup menu and adjust the overscan yourself. Otherwise you may need to hire a professional. If you were to increase the overscan and the problem remained, I'd say you have a problem w/ the projector itself.

I'm definitely running at 0% overscan, since I'm using a HTPC... all digital to the projector (DVI-HDMI), and the projector is 1-to-1 pixel-wise with my desktop resolution. Using TheaterTek and ffdshow. I doubt that's the problem though, I can't see the majority of studios letting something like that slip? It looks like EE to me, and varies by title.

The amount of edge enhancement and what you're seeing may go hand-in-hand as it may be a testament to the quality of the DVD. However I can't picture why edge enhancement would cause your problem (on the other hand I can't fully picture your problem).

How much overscan would you have to go to get rid of the problem? It can't be much otherwise I would think it would be rather distracting. I know you shouldn't have to set any, but would anybody other than yourself know if it's at 0.5%. You know your system, but if it were me, I think the problem you're having would be more bothersome than knowing a fraction of the picture is missing.