In relation to the results of the WFDF Observer poll an article is available on The Huddle written by the Chair of the WFDF Ultimate Rules Committee: Rueben Berg.
You can read the full article about his thoughts on Observers and how to keep Ultimate self refereed here: http://www.the-huddle.org/weblog/2010/06/16/wfdf-rules/
In the footer of the article there are a few important links that I’ll also provide below.
Differences between WFDF and UPA rules: http://www.wfdf.org/rules/WFDF_2009_v_UPA_11_Rules.pdf
Videos of WFDF rules: http://www.youtube.com/user/wfdfultimaterules