In case the op is serious about his question (i always have doubts about posts like this from new members with a lot of
fishy links in their sig
(says the guy with a fish as his avatar
) ):
The answer is: HD DVD can be worth to be purchased today, depending on your preferences, priorities and interests. Which you've said nothing about, so it not easy to speculate about them.
The format provides 1080p video with good to great audio tracks and a selection from a few hundred movies, some of those can be bought for really low prices. Some people consider that very interesting and very much worth it.