Project Server 2010 Performance & Capacity Planning whitepaper
Must read prior to any production rollout: Estimate Performance and Capacity Requirements for Microsoft Project Server 2010.
This performance and capacity planning document provides guidance on the footprint that usage of Microsoft Project Server 2010 has on topologies running Microsoft SharePoint Server 2010.
More information around performance and capacity planning for Project Server 2010 can be found on TechNet: http://technet.microsoft.com/projectserver
Additionally check out all the Microsoft Project 2010 Ignite videos released today, plenty of IT Pro content you all need to know: Microsoft Project 2010 Ignite Online Recordings Are Live!