Online Ad's Will Be Everywhere!
Remember rumours of advertising in Google Talk (Google's version of Instant Messenger with talk capability). According to Chris Thilik of Adjab the rumours were right but wrong company. Instead of Google it's Microsoft who have introduced ads to Instant Messenger. As Adjab allude to, the interesting bit could be that ads are contextual with your conversation!
With the impending decline of TV and newspaper adspend, it seems that web innovations such as this are readily taking up the slack.