Link Value Calculator
The WhenWeSEO link value calculator is a tool designed to approximate the marketing and advertising value of a link or an advertisement on different types of websites. The link value tool takes Google PageRank and Alexa Traffic Rank into consideration in order to aproximate a link price. You can enter both values to find out what a link is worth rather than the URL so you can do some "what if" analysis.
To get the PageRank for a page you can install the Google Toolbar.
Traffic Rank for a site can be found at Alexa.