Deus ex machina, literally "god from the machine," refers to a literary device in which a miraculous turn of events occur, solving a conflict.
The origin of the phrase is from ancient Greek theatre (though, they probably said it in Greek), in which actors portraying gods were lowered to the stage via crane (hence, a god from the machine). The god was usually nothing more than a plot device, showing up just in time to rescue the hero with special powers or divine judgement.
21 September 2008: Goldman Sachs is allowed to rush through the bank holding company conversion process! Deus ex machina!
14 October 2008: The FDIC guarantees all bank-issued debt! Deus ex machina!
23 November 2008: The Treasury announces they will guarantee Citigroup's losses! Deus ex machina!