beanstalk inc. did a study 1 month ago, stating it did: (hope they don't mind me quoting it)
"The first rel="nofollow" test is complete and the results are as expected. To avoid the results getting tainted we were unable to provide the specifics as to how the test was being run. Well, that's not the case anymore.
What we wanted to determine is whether a link to a website that had the rel="nofollow" attribute attached passed on anchor text weight. To determine this we built a few links to the Beanstalk homepage from a few forums that automatically added rel="nofollow" to all links. The anchor text we used for these links was bsi#*$! (<-won't let me show the word they used for some reason) knowing that the keyword itself fit into two criteria: it didn't appear anywhere else and it held no value to anyone.
As of this morning we are now seeing the Beanstalk homepage among the Google results for this phrase despite the fact that that the term appears nowhere on it and there are no links pointing to it with that keyword that do not contain the rel="nofollow" attribute."