As per the forum thread details:
I have just caught the Yahoo crawler having locks on some of my wiki pages. Not sure what can be done about it but seemed worth mentioning.
188.8.131.52 - Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp
184.108.40.206 - Mozilla/5.0 (compatible; Yahoo! DE Slurp; http://help.yahoo.com/help/us/ysearch/slurp
It seemed to have opened the pages with ?do=edit on the end.
<link rel="alternate" type="application/wiki" title="Edit this page" href="xxx?do=edit" />
Using dokuwiki 2009-02-14 with default template.
(Obviously I want my pages indexed, so a blanket ban wouldn't help much)