Just 15 years ago, if you could make a few bucks selling homemade charm bracelets through Prodigy, you were in the vanguard of digital revenue. These days, while the model's still the same, the scale is just a bit different. Take Activision for instance: The company announced during its Analyst Day presentation that it made $1.7 billion in digital revenue over the last 12 months. We're not sure what that works out to in charm bracelets, but it's a lot.

Though World of Warcraft has always done huge digital business, the company has gotten a big boost this year from Call of Duty: Black Ops and its hugely popular DLC. As you can see in the chart above, this year's earnings are a big jump from 2010 and 2009, which respectively brought in $1.4 and $1.2 billion digital dollars.

Note: When Diablo 3 launches, Blizzard will be taking undetermined fees off the top of player-to-player items sales. So look out for the 2012 Analyst Day when Activision will have to use at least some of the digi-revenue to buy a taller chart.

This article was originally published on Joystiq.