Free downloadable content has already been released for Mass Effect 2, days ahead of Friday's launch. Don't read any further if you're allergic to even tiny spoilers.
The nine pieces of DLC can be queued for download from the Xbox 360 website (well spotted, IGN). We're not sure whether these are supposed to be free or if there has been a mix-up.
Links to each of the additions are below. Note that other territories will need to change the "en-GB" part of the URL to suit their region.