HD-DVD was formally launched last week with a single, $499 Toshiba deck. HomeTheaterView has not had a chance to get in a review unit yet, but Evan Powell over at Projector Central bought a unit and gushes buckets about it.
Part of his review is a primer on the difference between 1080i and 1080p at the source vs. how its delivered to the display; this type of arcane differentiation is what pushes normal people to choose formats based on even dubious specs. For now, there's nothing concrete to compare HD-DVD to in the market. But there's so little content for HD-DVD that a few month lead over Blu-Ray probably won't make much difference in the long run.