Basically, I failed to exclude a whole swath of activity I should have
ignored.

An explanation, the new data, and an excellent link to a corroborating paper
by our usability group, is at:

http://robotlibrarian.billdueber.com/corrected-code4lib-slides-are-up/

My sincere apologies to everyone. I'm trying to do due-diligence, but anyone
passed a copy of my slides to anyone, please make sure they get the better
numbers.

-- 
Bill Dueber
Library Systems Programmer
University of Michigan Library