I'm not as interested in the social aspect, but oh my god have I been waiting for a recommendation engine for video games for a looooong time. It's especially a problem if you're running on an underpowered rig, where playing the latest titles isn't always an option. This will be great if they can somehow provide a netflix-esq 'play this next' based on your past playing stats. I've discovered some great games like Hearts of Iron II, Mount & Blade just through pure chance. Providing new (read:younger) gamers with a way to discover games made prior to ~2009 would be a big boost for all parties involved.