The report also shows that between $2.6 and $2.9 billion was spent on "used games, game rentals, subscriptions, digital full game downloads, social network games, downloadable content, and mobile game apps."
Now, it is likely that used games account for a large percentage of that figure, but it is interesting to see that this much revenue is being generated from secondary sales, DLC, digital games, and more.
Hopefully, the full report will break it down by each category. I'm very curious to find out how much money digital games and DLC generate on the whole. Earlier this year, the NPD Group reported that 48% of PC games sold in 2009 were done so digitally. I'm guessing that number will be higher for 2010.