All the information you need is available at the TechEd website.
Once connected you can view the tables information and and execute queries as if you were on the fly without opening any other program. DB Manager gives this great tab views everytime you open a new table for a tab for executing a query. You can view the table content simply by right-clicking on the table name and clicking 'Show Table Data'. Wasnt that simple if you were a developer working on a test machine. You can also run query on the database just as you do it in your other programs. A screen shot below will show you how DB Manager gives the result.
This should give you a pretty good idea on how to get started with the DB manager.
Note: The Database Manager as of now comes only with Microsoft SQL
data provider. Therfore, if you are a MySql user you might not find this
useful. Well atleast not yet!
For any problems or feedback on DB Manager you can post at the DB Manager Forums on the iis.net site.
"Congratulations, You have been awarded as the Microsoft Most Valued Professional (MVP)by Microsoft for your community participation and technical expertise"