I just joined BloggerSwap. It is a blogger community where you can exchange banner with other bloggers. The image banner that represents the blog site should have the required size of the 120×120. It is FREE to join. All you have to do is to register you blog, set your username and password, exact url of your site and image banner. BloggerSwap reviews submission and will send notification of approval after 24 hours. The banner exchange will take effect after the approval and applied only within the category your blog belongs. What are the benefits? Traffic and credit earnings.