We identified that same lack of cross project reporting in TFS that your organization saw (and it's not just TFS, many other tools do not do a great job managing work and people across multiple projects). It that reason that we build xView and are continuing to expand upon it with each release.
Our R4 release (scheduled for early July), will have some improvements to xView, but nothing to help logically group projects together or display consolidated burndowns.
We're currently planning our R5 release, so I encourage you to visit our feedback portal at http://bit.ly/TeamPulseFeedback
and enter your request in there.
Each release, we use the votes that we see on these items to help drive what features we include in our upcoming releases.
All the best,
TeamPulse Product Owner