Sony has announced on their site that they are going to discontinue the development section for dash product next month.
The company would no longer support development of new apps for this platform. They would however continue to offer access to existing apps.
This closure includes the dash developer forum and dash developer support email address (firstname.lastname@example.org) which will close on March 31, 2012. Sony dash™ applications will remain available. Thank you for your contributions and we encourage you to continue your development activity on Sony’s other platforms available at SonyDeveloper.com.