Today, the Diablo III website got an upgrade in the form of an official skill calculator. No longer will you have to go back and forth between lists of skills and their rune effects to plan your characters! The skill calculator itself looks very similar, if not identical, to the skill UI seen in the beta, and has three groups of skills for each class. To use it, simply head over to the Skill Calculator page found on the Diablo III site, select your class, and the rest is pretty much self explanatory. You should keep in mind that the numbers inserted into skill descriptions are based on level 60 characters with level 7 runes.
The skill calculator also provides a very convenient way to see the description of each skill and its rune effects, along with the icon for each skill. If you're starting from the home page instead of the link above, select the Game tab, look under Tools, and you'll find the link to the skill calculator there. The Game tab also provides an interesting look at future updates to the official page.
Another update on the official site is a new page on Diablo III's shared stash. Although its not anything new, it does provide a nice overview of the stash's functions in the upcoming game. The article about the shared stash also reveals that Hardcore characters will have access to a different stash and Auction House than Normal characters. The wording of the section on the Hardcore stash also seems to hint that there could be some items available only to Hardcore characters that you can't find on Normal, or possibly the other way around.
Other than that, the site was also updated with a What's New in Diablo III page. It provides short paragraphs on Runestones, Followers, Crafting & Artisans, the Auction House, and other major parts of Diablo III that were previously unseen in the series or have been improved upon for the third installment. For the sections that have pages on the site, there are links to click through to. However, for features such as Artisans and Followers, there are no official pages yet, but we'll be sure to let you know when those pages get updated.