An external link that I added to Wikipedia was indexed by Google overnight - even with the "rel=nofollow" tag.
Is it possible that the Google spider is following the 'urlexpansion' text?
Notes: Google search: http://www.google.com/search?hl=en&q=yellowikis
source code from http://en.wikipedia.org/wiki/Oxfam:
External link added feb 14 05 ...<li>Yellowikis lists Oxfam's <a href="http://www.yellowikis.org/wiki/index.php/Oxfam" class='external' title= "http://www.yellowikis.org/wiki/index.php/Oxfam" rel="nofollow">Contact details</a><span class= 'urlexpansion'> (<i>http://www.yellowikis.org/wiki/index.php/Oxfam</i>)</span></li>...