Several years ago, Fast Company took a look at how to best handle complaints -- from clients and colleagues. Late last month, the Orange County Register covered the ongoing presence of complaint Web sites.

According to the Pew Internet & American Life Project, 26% of adult Net users -- more than 33 million people! -- have gone online to write a product, service, or personal review. Clearly, business leaders may prefer customers -- disgruntled and gruntled alike -- to contact them directly. Here are some of the places you can keep tabs on what people may be saying about you and your business:

• Complain Complain
• The Squeaky Wheel
• Planet Feedback (now part of Intelliseek)
• Complaints.com
• Epinions (more product oriented)