When George W. Bush had a birthday, Nintendo sent along a DS Lite and a helpful copy of Brain Age: Train Your Brain in Minutes a Day. And Dubya can definitely use a mental workout. Now, late night talk show host David Letterman is getting ready to celebrate his 60th birthday and Nintendo is giving the gift of gray matter all over again. This time, however, I'm sure there's no secret pun hidden within the act of giving. Nintendo sent both Dave and his mother a shiny new DS Lite and a copy of Brain Age so they can compare scores and give the ole cranium a polish.