There seems to battle of the bands taking place.
One of the bands is represented by The Motley Fool. They say of XBRL, "The Most Important Shareholder Initiative in a Decade" (they may be talking about Microsoft's Silverlight, but I don't think so). You definitely want to check out the link to the Microsoft Key Performance Indicators referenced on that page.
The other band is the FEI. They say of XBRL, "FEI on Data Tagging: No Benefit to CFOs".