Here are some best web 2.0 site list. A great list of sites to get high quality back links
I'm searching for more at the moment, will post more if I find. Share more if you have.Code:http://www.wordpress.org
http://www.tumblr.com
http://www.livejournal.com
http://www.blogger.com
http://www.squidoo.com
http://www.typepad.com
http://www.multiply.com
http://www.weebly.com
http://www.blog.com
http://www.yola.com
http://www.spruz.com
http://www.webnode.com
http://www.blinkweb.com