"The PS3 may have the more robust exclusive game lineup for this year, but the Xbox 360 is leading the 'downloadable content' (DLC) lineup for 2009. With the skyrocketing development costs, the good old days of third party exclusives is coming to a end. However, Microsoft has waged a new war revolving around exclusive DLCs.
Many studios will refuse to develop a game exclusively for a specific console. However, DLC is quickly becoming the new and popular avenue to distinguishing a console from the pack. You could say that Microsoft invented/initiated the concept of console exclusive DLC."