I use
Google Reader with the user script (Greasemonkey)
"Google Reader Preview Enhanced". The script inserts an
IFRAME into the current feed entry to display (preview) the web page referenced by the entry. The
screenshot below shows that the light-blue toolbar of the reading list (Next/Previous Item buttons; see
red arrow) covers a small part of the IFRAME contents; when links get covered a ClearClick Warning is triggered, when I click on a link in the visible part of the link list. The toolbar effectively shields the covered links from mouse clicks (I tested this). Therefore the ClearClick Warning seems to be
premature.

(Open image in separate window to see all of it.)
Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 - Build ID: 20090824101458
Regards,
Heribert Slama
Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3