Free high PR directories

Links from High page rank directories not only drive traffic to your website but also improve Page Rank of your website which brings you better position on search engines. So here are the links to some PR7+ free web directories:
http://www.dmoz.org PR9
http://dir.yahoo.com PR9
http://www.stpt.com PR8
http://www.open-site.org PR8
http://www.Thomasnet.com PR8
http://www.dirone.com/ PR7
http://www.2rss.com PR7
http://www.exactseek.com PR7