1080p DVD player

I saw this post about the Classé CDP-300, which is a DVD player that has some pretty cool features.  It has a touchscreen lcd display on the device itself, to allow previews of videos playing.  This is a great feature for playing DVD-Audio discs where you don't really need the video display.

The one feature that I don't understand, except for the bragging rights, is the 1080p output.  DVDs inherently have a resolution of 480i, so this DVD player has a line doubler that increases the resolution.  I don't know if this is better than the line doublers in nice HDTVs.  Also, I don't know how many TVs support 1080p input.