An interesting interview with Dr David Finkle from NORAD and Dr karl (Australian science personality).
It was recorded in November 2010 on a the popular Australian radio station triple j.
download mp3 mpegmedia.abc.net.au...
or go here, scroll halfway down and listen. www.abc.net.au...
they dont say much about UFOs but he gave me the feeling they (NORAD) know they are real.