shorebreak - 6:03 pm on Dec 1, 2011 (gmt 0)
For my SEM-focused blog, 73 of the last 110 Google organic visits had keyword referral blocked. That's 66.4%.
My bet is we go from 15% industry-wide today up to 40-50% inside 24 months.
IMO, this is a much more important, strategic topic than the industry has as of yet been prepared to acknowledge.