Fresh from the clogged tubes of teh intarwubs…
"You need to know your audience, though, of course, this is true whether or not you want to start using HTML5. If the majority of your site's visitors still use Internet Explorer 6, then you have no reason to rush. On the other hand, if your site is primarily for mobile browsers on iPhones and iPads, what are you waiting for? But if your site falls somewhere in the middle — as most do — here are some handy guidelines to ramping up to HTML5." Lots of fun stuff coming down the pipe. Only downside? Until everybody's using it, you gotta do twice the work.
<ul> styling tricks