Thanks to the folks over at Steam, all Steam users will be able to install a spectator app in DOTA 2 as of today. Users will be able to watch any recent or live matches, plus they will be able to watch the international tournament, where players will be playing for a massive cash purse.
You can view matches from the players perspective, or to really make the comparison to Monday night football, you can watch it with in-game commentary.
Via: Steam