'Remember Me' - a really nice and overlooked distopian blend of 'Deus Ex' and 'Assassin's Creed'. Its a shame Capcom crashed before they made any more in the series.
Prince of Persia - The Forgotten Sands. The PoP games for the original XBox are my favourite third-person action games of all time. This 360 release escaped me at the time so I am quite looking forward to giving it a bash thanks to XBox Live!