Microsoft® Project Code-Named “Houston” is a lightweight and easy to use database management tool for SQL Azure databases. It is designed specifically for Web developers and other technology professionals seeking a straightforward solution to quickly develop, deploy, and manage their data-driven applications in the cloud. Project “Houston” provides a web-based database management tool for basic database management tasks like authoring and executing queries, designing and editing a database schema, and editing table data. It is available on SQL Azure Labs.
This web/Silverlight SQL Azure management tool is great because now you can administer your database without needing to install SQL Server Management Studio in your PC, so potentially, you could use any computer with just a browser (and the Silverlight plugin). :-)
Of course, take into account that it is a limited management tool. It is not so powerful for Administrators as it is the traditional SQL Server Management Studio that comes with SQL Server 2008 R2.
BTW, current state is BETA.
Take a look, its UX is impressive!