creat one profiles backlink with do-follow link. one backlink only for one account.
such as
http://www.kiva.org/lender/software5169 - Read more

You can get  a easy and free backlink from Google profiles with do-follow link.
e.g.
http://www.google.com/profiles/hongchen1977 - Read more

Creat a account, and you will get two do-follow backlink in your account profiles. like:
http://www.fastcompany.com/user/yongqiang-xie - Read more

You can get 5 free dofollow profile link from this site.
like:
http://software2010.vox.com/ - Read more

This Zoominfo Web 2.0 sites allow you to create profiles with Free do-follow backlink  to the web site listed in your profile. - Read more

kirtsy is a social media platform of pure goodness, and web 2.0 site,
You will get one free backlink on your profiles in Kirtsy account.
One dofollow backlink only for one account. 

http://www.kirtsy.com/user.php?login=Software2010 - Read more

Site devoted to latest in digital multimedia. News, tools, guides and a massive discussion forum.
No-Follow but allow sig link and very high traffic ,
And you will get free sig backlink, free dofollow profile backlinks( add link list),
e.g.
http://my.afterdawn.com/bluray201/ - Read more

Online source for punk music, free mp3s, news, tabs, lyrics, forums, downloads, multimedia, pictures, aim icons, wallpapers, and more.
This is a forum, you can get a free backlink from this forum with profile dofollow backlink. one account only place one link.

e.g. http://www.absolutepunk.net/member.php?u=1111251 - Read more

This is a Movies forum and show business. Get free backlink from dofollow profile link ..
e.g.
http://www.movie-list.com/forum/member.php?u=51650 - Read more

This is a health forum about Australian based low carb, health and organic resource and support community.
You need to register and become a member.  and write Visitor Messages to youself with your site info, you get  free dofollow backlinks from http://www.apinchofhealth.com.

Eg: http://www.apinchofhealth.com/forum/vbb/member.php?u=4587 - Read more

Discussion forums for men's style. The best men's clothing, streetwear, denim, fashion trends, grooming, health, gadgets, sports, home and lifestyle.
sig can be used for free backlink. need to register.
e.g.  http://www.styleforum.net/member.php?u=74931 - Read more

This is a forum for Search Engine Optimization discussion.  You will get free backlink from dofollow profile backlink. - Read more

This is a  Large discussion forum for webmasters and web developers.
You only get a free profile dofollow backlink on your account.
e.g 
http://developers.evrsoft.com/forum/member.php?u=17043 - Read more

This ia a webmaster forum, You will get a free dofollow profile backlink on your account. and when you reach the post count of 10 , you'll be able to have a Signature and get backlinks.
e.g.

http://www.geekpoint.net/members/software2010.html
- Read more