Hopefully, we'll eventually have a High Definition disc standard. Right now, there are two groups, Blu-ray and HD-DVD, fighting over the format. Both require new blue lasers. Sorry but it's VHS and Betamax all over again. Hopefully, it won't take as long to come to a standard.
In the meantime, your only alternative is to use Microsoft WMV HD formatted DVD's, which will play on very few DVD players.