An intro to HTML 5 from Smashing Magazine:
So in the spirit of the upcoming change we decided to release a handy printable HTML 5 Cheat Sheet that lists all currently supported tags, their descriptions, their attributes and their support in HTML 4.
Please notice that the specification is an ongoing work, and is expected to remain so for many years, although parts of HTML 5 are going to be finished and implemented in browsers before the whole specification reaches final Recommendation status. We’ll do our best to update the cheat sheet when new changes will become known. The cheat sheet was created by our friends from Veign.com and released exclusively for the readers of Smashing Magazine.