The link for this paper was posted on the COLLIB-L discussion list. I skimmed it. Haven’t had a chance to read it yet. I have used Google Scholar in my class this semester. The students had mixed opinions on it’s value.

Banks, Marcus A. The excitement of Google Scholar, the worry of Google Print. Biomedical Digital Libraries, 2(2). Published March 22, 2005.
http://www.bio-diglib.com/content/pdf/1742-5581-2-2.pdf