rlange - 2:27 pm on Mar 13, 2012 (gmt 0)
Access denied appears to primarily be URLs that returned a 401 status.
403s are listed in the "other" category.
Hmm... I'm seeing 403's under "Access denied" and "Other". The ones under "Access denied" are internal, while the ones under "Other" are pseduo-external links. I say pseudo-external because we use an on-site script to redirect to off-site URLs for tracking purposes, so it's essentially a 303-to-403 (or 400 in some cases).
"Restricted by robots.txt" seems to be gone.