A NASA satellite UARS (Upper Atmosphere Research Satellite) is expected to fall back to Earth on or around Friday, September 23, according to NASA officials.

The satellite will break into pieces during re-entry, and not all of it will burn up in the atmosphere. The risk to public safety or property is extremely small, NASA says.
Since the beginning of the Space Age in the late-1950s, there have been no confirmed reports of an injury resulting from re-entering space objects. Nor is there a record of significant property damage resulting from a satellite re-entry, NASA says.

I am not trying to be "chicken little" here, but according to estimates about 26 pieces of the UARS satellite will not burn-up when re-entering the atmosphere, with the biggest piece being about 300 pounds. NASA advises that if you find something that may be a piece of UARS, do not touch it and contact local law enforcement.

You can track the movement of the satellite here.

(From CNN)