Installed and absolutely awesome. You've automatically made my XBMC addon experience 20% more fantastic.
Two noteworthy items.
First, it looks like the videos don't come with descriptions. At least in the html, there's a div class="episodeDescription" that might be useful. (Actually on the page I'm looking at it's <div class="small episodeDescription"> I don't know what the "small" class is for.) I'm not sure how easy it would be to parse that. There's also metadata in the html description that reads (for e.g.) <meta property="og:description" content="The cast of Red vs. Blue lays down essential survival tips for navigating the internet.">
Second, the Red vs. Blue category appears to have both Red vs. Blue videos and videos from all the rest of the site. I'm not sure if that's a site problem or not.
Regardless, this is awesome, and I want to thank you a TON for your work.
Edit: Upon review, I think I know what's going on in the Red vs. Blue category. Each category actually has three tabs of video links: "Trending" "newest" and "<category>". For some reason, while all the other categories default to the <category> tab, the Red vs. Blue category defaults to "Trending," so the actual page to parse is
http://roosterteeth.com/archive/?id=5179&v=more where "v=more" is the crucial bit, rather than "v=trending." That should provide links to seasons 1 through 10 along with a default display of 'all.'