If you work on the web you have probably heard about HTML 5. It is the next evolutionary step in web programming and the sooner you familiarize yourself with it the better.
There is a lot going on in HTML 5 and instead of getting into it myself, I think I should just suggest a few articles I have come across to steer you all in the right direction.
WC3 – A vocabulary and associated APIs for HTML and XHTML
Smashing Magazine – HTML 5 and the Future of the Web
A List Apart – A Preview of HTML 5
If you knew nothing about it before, checking out these articles will fill your mind with so much HTML 5 your eyes will bulge.