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Nofollow as a link attribute causes Google to drop those links out of our link graph. If you have a nofollow link from page A to page B, we won't crawl via page A's link to discover page B. Note that we may still find page B via other links around the web, though.
Google does not use nofollow links for discovery. They do use other methods for discovery.
[edited by: tedster at 6:49 pm (utc) on Mar 11, 2010]
or would coming off as an amateur webmaster...maybe be better
[edited by: tedster at 1:22 am (utc) on Apr 20, 2010]
If Google sees a link on Wikipedia , it pays attention to the association.
The closest we have here is gn_wendy's anecdotal evidence -- which is not a true test, but rather a data point.