The Star Wars sextology has evidently been remastered in HD, just not released on discs yet. I've seen listings for HD broadcasts of all the Star Wars episodes on either StarzHD or HBO HD, can't remember which. And I checked some of them out and they were real HD transfers, not just 480 upconversions in 16:9 like some HD programming.
I have them all saved on my DVR. They were/are on HBO and Cinemax. Though, HDTV broadcasts are nowhere near as pristine as a Blu-Ray copy would be, due to the compression artifacts added in order to send it over cable and satellite. :(
I also have the Lord of the Rings trilogy saved on my DVR as well. Those were broadcast on TNT in HD. Again, compression artifacts and areas of the movie were compromised further (such as shadow details) in order to submit over cable and satellite.
I also have two of the Matrix trilogy on DVR (I'm missing the best one, the first one). Again, HD cable broadcast, with compression artifacts.
That 500 GB drive sure came in handy. I must have 50 HD movies on my DVR. ;)