I'm a Web Developer both in my spare time and at work and I actually feel like I have to manipulate the CSS of the Bnet forums to decrease the base font size in the .forumPost article .post_body rule!
16px is [i]waaaay [/i]too big, it feels giant, and that's on my 1080p screen! I couldn't imagine trying to read it on a lower res!
I'm also quite surprised that the site has no media queries to deal with different resolutions but I guess that's beside the point!
Other than these, I do love what you've done with the place.. :)