I do not have much to add to the title...
Whatever Works starred Curb Your Enthusiasm's Larry David, and came out in 2009 in the USA. UK residents may have blinked and missed it as it was in the cinemas for approximately 3 days. However, from today, you can get your hands on the DVD goodness at all good (and some poor) retailers now, including Amazon:
Whatever Works DVD Amazon UK
Whatever Works DVD Amazon US
Whatever Works Blu-Ray Amazon US