On Tuesday American Airlines Flight 31, a Boeing 757-200 (N192AN) from Los Angeles to Honolulu was diverted back to LAX and did an emergency landing after about an hour in flight because of an odor and possible haze in the cabin. The passengers were evacuated on the runway using the emergency slides.
Video by KNBC
Raw Video of the Emergency Landing by AP
Flightaware log: http://flightaware.com/live/flight/AAL31/history/20080805/1600Z/KLAX/KLAX