In an article in Silicon Valley Watcher, BlueLithium "burst[s] the myth of contextual ads."
The conventional wisdom, as proposed by Google et al, is that placing advertising on a web page in its context gets the best results. Mortgage ads on mortgage pages, etc. In fact, Google recommends to its AdSense partners that Google ads should blend into the page, same colors etc.
BlueLithium, the online ad network, says that this isn't true when it comes to serving ads based on users' behavior. Its BL Labs research division found that out-of-context ads perform better ...