The changes between HTML5 and HTML4 arent that big. There is an experimental HTML5 validator that can already validate websites for HTML4, of course it doesn't validate 100% correctly. But the validator shows that HTML4 strict pages don't differ so much from HTML5.

But i have to agree with Kalle, I'm much more intrested in CSS3 since it brings a lot of new fun features to our browsers. I think I'll use some fun new features in my next website, some of those that don't change the normal rendering if your're using a browser who doesnt support it.

Can't wait!

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Nunchaku! Who doesn't like martial arts? =)