Microsoft Codename “Dallas” is a new information service that lets you leverage data sets and web services from public and private sector in your applications through a simple consistent API. Here you can learn how to get started consuming “Dallas” data in your applications and analytics workloads.

You need an invitation code for this like other services Windows Azure, SQL Azure.

You can obtain one from here

Being a developer, you can explore ‘Dallas’ services using following step by step Dallas Course

You can watch an introduction video here

Cool.

Narendra