Mass Effect: Redemption series, Dark Horse Comics will release a compilation in June. Amazon has the trade listed with a June 2 debut, while Dark Horse lists the Redemption bundle coming out June 23. Either way, putting in a pre-order with Amazon or your local comic-monger may be a sensible course of action if your interest in Mass Effect extends beyond the games.
For those who don't need physical copies of their comics, several issues of Redemption are already available on the App Store. The events in Redemption lead up to protagonist Liara T'Soni's appearance in Mass Effect 2, which is rumored to conclude with some upcoming DLC.
Source -- Mass Effect Volume 1: Redemption [Amazon]
Source -- Mass Effect Volume 1: Redemption TPB [Dark Horse]