I recently performed calibration on my Panasonic Plasma TH-46PZ85U display using CalMan Software and a i1Display2 Colorimeter. I posted the results in my blog. The article has before and after CalMan data graphs, along with sample before and after photos of HD cable signals.
I wanted to share my experience with the community. It may provide you with another data point if you're contemplating display calibration.
My blog link... (If this forum doesn't allow links, just go to wordpress.com and search on "elephantav").
Let me know what you would do differently, or how the article could be improved.
Thanks