Microsoft has released an updated version of the IE9 preview. (As promised, new releases will launch every 8 weeks or so). In this new version, there are a number of new demos to complement those found in version one of the release, all of which are still available.
There are also four new HTML5 demos showing off things like CSS3 media queries, DOM range and selection and more plus graphics demos using diagrams, org charts and even a tweet cloud, where you can hover over Twitter search terms floating in clouds to view more information about a randomly selected tweet.
Interested developers can grab the latest preview from here.