I find HDTV's presents HD photos very well because they are backlit. The other advantage is it's easy to just switch on a
slide show on the HDTV before your guests become aware what you're up too. With slide projectors, as soon as your guests see you pull out the projector to show them 30 minutes of your last boring vacation, they get a sudden headache, grab their coat and tell you they have to go home to rest, even skipping the great desert you prepared. With HDTV's, you slip it in during the half time out.
That's why I don't visit people with HDTVs, lol. They usually also have a digital camera with huge storage, so the slide shows are so much longer.