So, in summary, to get the full range of DBPro, here’s the sequence of events:
· Visual Studio Team System full installation (link to trial)
· Visual Studio Team System for Database Professionals, version 1 (link)
· Visual Studio Team System, Service Pack 1 (link)
· Visual Studio Team System for Database Professionals, Service Release 1 (link)
· Visual Studio Team System for Database Professionals, Power Tools Release 1 (link ,optional)
And finally, as a side note, when Visual Studio Team System 2008, code-named Orcas, ships, DBPro will be finally integrated into the main VSTS installation package, and you won’t have to manually add us to the installation any more. 
Se uno compra solo la DB Pro, allora la installa, installa il SP1 di VSTS, installa la SR1 e infine i Power Tools...