For the second year in a row, Microsoft is inviting Xbox Live users to vote for their favorite downloadable games on Xbox Live Arcade. Six games were nominated in each of nine categories, including Best Overall Arcade Game, Best Cooperative Multiplayer Game, and Best Innovation in XBLA, to name just a few. Number-None’s Braid is a leading contender, nominated in five different categories, and publisher Capcom enjoys a strong presence as well with Street Fighter …