Following close on the heels of the Google/DoubleClick merger, Yahoo! made a big announcement this week that they are buying (or have bought) the remaining 80% stake in Right Media, an ad network that they already owned 20% of. Not to be left out of the action, a rumour is going around that Microsoft, who apparently lost out in the bidding war for DoubleClick, have their sights set on 24/7 Media with a rumoured bid of $1Billion. Seems like everyone's banking on online advertising these days to be the ultimate money-making engine of the internet, so let's just hope all the folks out there who actually have to put up with these ads don't start installing ad-blockers. ;-)