Kasumi's Stolen Memory, the first DLC addition for Mass Effect 2, just reached Xbox Live Marketplace, after being delayed much of the day due to an unspecified issue with Microsoft according to BioWare.
Earlier in the day a BioWare spokesperson acknowledged the delay to IGN and said the studio was working with Microsoft on a solution. We just checked Xbox Live five minutes ago and Kasumi's Stolen Memory is online and available, for 560 Microsoft Points.
It's the first premium DLC package for Mass Effect 2, so even those who are a part of Cerberus Network will have to pay the freight for the download.