Slowly, bit by bit, Microsoft is whipping the Xbox Live Indie Games marketplace into reasonable shape. Its latest change is to allow developers, from Wednesday, to change the prices of their games every seven days--a huge improvement over the previous 90. As other digital distribution platforms have shown, changing the price up can hugely help games.
Being able to change prices more frequently mean devs can host short sales, whipping up interest, and rapidly adjust their pricing if a game's not selling too well. This is far from the biggest problem that was affecting XBLIG, but it's certainly a welcome change.