If you are looking for more here they are….10 more authority sites, enjoy 
1. http://www.BlueDot.us it’s a PR6
Create your free account and then install the blue dot appliaction on your toolbar. You can also list links to websites in your profile under “About Me”
2. http://www.Answers.Yahoo.com it’s a PR9
Create your free Yahoo ID. Ask your questions or post responses to questions. You can post your url with your answers.
3. http://www.SearchWarp.com it’s a PR4
Create your free account and submit your articles. Link to your site from your author’s bio or your article
4. http://www.Xanga.com it’s a PR7
Create your own free account and then create a keyword targeted blog. You can link to any website from your blog posts.
5. http://www.TradeBit.com it’s a PR6
Create your own free account and then list your product linking to your website. Put your target keywords in your listing title or headline.
6. http://www.Weebly.com it’s a PR6
Create your free account. Add content to your weebly website and include links to your websites.
7. http://www.Tumblr.com it’s a PR6
Create your free account. Use your keywords for the url of your tumblelog.
8. http://www.DailyMotion.com/us it’s a PR7
Sign up for your free account. Upload your video, include your keywords in title, description and tags.
9. http://www.YouTube.com it’s a PR8
Sign up for your free account. Upload your video include your keywords in title, description and tags.
10. http://www.MetaCafe.com it’s a PR7
Sign up for your free account. Upload your video include your keywords in title, description and tags.