I have extracted 4 pages from the ECB FSR of June 2011 to a summary '.pdf' file;

these pages are a box in that FSR (if u are familiar with the FSR you will gettit); the box is titled;-

COMMON TRENDS IN EURO AREA SOVEREIGN CREDIT DEFAULT SWAP PREMIA

& it contains a beautiful & succint description of how the ECB uses the PCA technique in this space.

I have placed the summary file on a url on my website (for YOU!)

here it is;-

http://asymptotix.eu/iqk

I think its THAT cool