+2  A: 

Currently Microsoft do not provide any mechanism for extending the build report in VS 2008 or VS 2005. They are doing heavy changes to the build report for TFS 2010 however and I know that customization of that report has been a much requested feature but I'm not sure what the status is of that yet.

Martin Woodward
Thanks Martin. You're a indispensable wealth of TFS knowledge.
Mark