If you're looking for some evidence on the ROI of deploying Visual Studio Team System and Team Foundation Server than these 2 case studies on VSTS are some great evidence from and for customers, showing the high return customers can get by deploying VSTS.

These 2 studies include an ROI analysis- one which shows an ROI of 203%  & a payback period of only 6 months for a global manufacturer and the other study which shows an ROI of 512% and  a payback period of only 3 months.

Both case studies are now available on www.microsoft.com/casestudies:

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Visual Studio Team System, Team Foundation Server, productivity, methodology adoption, Microsoft, Visual Studio 2005, Developer, Development