Okay, folks. It's been pointed out to me that having links to my various posts with actual numbers might be helpful for people looking to linkspam people saying stupid things on the internet about games not being sexist. So I'm putting up this post just to collect the most useful stuff in one place. For the most part, what you'll find here is numbers based on surveys of game artwork.
My original article about sexist depictions of women in gaming can be found here. In it, I surveyed art from MMOs, console games, CCGs, and tabletop RPGs and came up with detailed numbers of sexist depictions in various sources.
There is also a followup survey done of the relaunched galleries on the official WoW site after the release of the Cataclysm expansion. The survey is the first part in a series that also includes posts on why the numbers are misleading, unbalanced class depictions, and comparisons of good and bad character design.
It's very probably that any of these links will be responded to with comments along the line of "but gaming is sexist against men too!". You may want to link them to this post about why idealized figures are not the same as sexualized figures. (Do note that since I was pretty angry when I wrote that post, it's likely that they will respond that I'm biased.)
Feel free to link to any of these posts if you feel like it. This post will be edited to add new links whenever I do something that includes actual numbers.