The recall is to fix an issue with the passenger side front airbag that may not deploy in an accident. Apparently according to the NHTSA cracks can develop in the passenger seat that could make the seat detection system fail thereby causing the airbag to not deploy.
The recall involves the 2006 BMW 3-Series, 2004-2006 5-Series and the 2004-2006 X3 SUV. Fortunately there have been no reported injuries due to this recall.
Full Story: CNNMoney