I was reading a good article of seo. Written by Justilien Gaspard he has also own blog of Link building http://www.justilien.com/ I like most of his seo article.
Google's public attack on paid links has caused a flood of scared Webmasters who are scared to link to other sites. Google's assault on paid links has forced Webmasters to ask: What is a paid link? Here are the top five trends and challenges SEOs, link builders, and Webmasters face
1. Webmasters Scared to Link Out
2. Overuse and Abuse of NoFollow Tags
3. Neglected Link Building Destroys Top Rankings
4. Google Paid Links Assault: Collateral Damage
5. Scarcity of Link Building Resources