Five things you should know about HTML 5 by Mark Pilgrim .
HTML5 is giving web designers and developers new capabilities that were things of fantasy with previous versions of HTML. Web pages will now be more semantic with the use of structure specific tags. Visual elements like rounded corners are now built in, and so is the ability to create drag and drop interactivity. Even though HTML5 is not fully supported in major browsers, there are those that are pushing forward and experimenting with its new features. In an effort to encourage you to do the same and to prepare you for the future, WDL rounded up useful HTML5 tutorials and cheat sheets.