1.
http://www.google.com/profiles
Create a Profile > Edit your profile info > Scroll down to the section "Add
custom links to my profile"
PR 10
2.
Flickr: The Help Forum
Sign Up > Personalize Your Profile > Describe Yourself Box > Add HTML
Code For Your URL + Anchor Text
PR 9
3.
Excite /
Create an account > My Bookmarks >Edit it
PR 9
4.
BusinessWeek - Business News, Stock Market & Financial Advice
Choose an article > Leave a Comment (Older Articles will have a Higher PR).
PR 8
5.
philly.com: Philadelphia local news, sports, jobs, cars, homes
Register > Choose any (or related) story you like > Leave a 'comment' (Older
Story’s will have a Higher PR).
PR 7
6.
AOL Answers. Ask Us Anything
Again Like yahoo answers. Look for questions related to your
niches/keywords and answer them linking to your site. You'll receive backlinks
and traffic.
PR 7
7.
Above the Law: A Legal Tabloid - News, Gossip, and Colorful Commentary on Law Firms and the Legal Profession
Register → Edit Profile → Edit 'Bio' box to create your anchor text backlink
PR 7
8.
Ask Questions, Get Free Answers - Blurtit
Like yahoo answers, just answer a question with a backlink included. Niche
related questions will then also send you traffic
PR 5
9.
Wired.com
Register → Choose an article of your interest > Leave a 'comment'
PR 9
10.
MySQL Forge :: Dashboard
Register → Edit Profile → Enter your backlink in the 'Your Website' section
PR 7
11. The application submits your site to up to 5,000+ PR6 whois sites.
VerifiedFile.com - SEO Ranking Services - Quick Google Index
PS. Some of the links are copied from a tutorial. I have posted the thread in webhostingtalkforums and other forums as well.