two more polls and two more complete different views,
http://www.crash.net/f1/poll_results/110/who_was_to_blame_for_hamiltonwebber_crash.html
http://sidepodcast.com/2010/05/30/post-race-debate-webber-or-vettel-to-blame-for-lap-41-crash/
The second link is from a completely different incident.