The Windows Azure HDInsight Service Preview has been upgraded and is now integrated with WindowsAzure.com
The HDInsight preview that was hosted on this site (hadooponazure.com) has moved to be a fully integrated, into the windowsazure.com portal. To learn more about the new HDInsight go here.
The service includes a number of enhancements and features ranging from simplified cluster deployment, performance & robustness upgrades, the ability to deploy a cluster of up to 40 nodes and more. A number of tutorials and walkthroughs are available here.
Here is quick walkthrough
1. To sign up, log into your Windows Azure account at http://www.windowsazure.com. At the bottom of the portal, click on New (+).
2. Then click on DATA SERVICES followed by HDInsight. Use the preview program link to navigate to sign up page.
At the Preview features page, also accessible from https://account.windowsazure.com/PreviewFeatures/, click on try it now next to Azure HDInsight Preview. Please be warned that this might take up-to a few days.
Getting Started and more Learning Content
https://github.com/WindowsAzure-TrainingKit/PRESENTATION-WindowsAzureHDInsight download using the zip link.
Getting to Grips with using HDinsight Hands-on Lab
MSDN Channel 9 Online Video Series