HD-DVD players will be here December 2005. There is only 1 format, Sony's Blu-Ray format. I usually scratch my head when Sony comes out with their own format, but they managed to get all but 2 major manufacturers on board with Blu-Ray, so it's a done deal.
It helps that every major DVD produced in the last 5 years has also triggered the production of an HDTV master, ready to use when HD-DVD hits. Most major studios planned ahead. I wouldn't mind paying another $15-25 each for the handful of movies that would benefit most from HD transfers. Of course I don't need to buy Groundhog Day again, but Terminator 2 would be fantastic to own in HD.
The difference from DVD to HDTV can be stunning, especially with videotaped productions like sports and documentaries.
My HDTV Gallery (the first of its kind on the Internet)