The 1815 is the king of this hill and features Epson's EasyMP (Epson Administrative SYstem for Meetings and Presentations) which, among other things, allows you to display content off CompactFlash cards and USB drives without the need for a PC.
In addition, the Home Cinema 750HD features Epson's latest RF 3D glasses that last up to 40 hours or up to three hours with a new three-minute quick charge.
Epson's 3D display glasses, the Moverio BT-100 have been floating around as a development platform for a couple years, and APX Labs is the latest to hack the headset.