Along with everyone else who's moved onto HTML5, I've spent significant time looking at the possibilities of the next generation of HTML.
There are other limitations, but for the most part I've found that HTML5 can be used today especially with the support of javasript shims and polyfills.
Here are a few examples that I thought were pretty cool.
For anyone interested in Javscript, HTML5 and CSS3 the site worth checking out.
Happy coding :)