This video fascinating video filmed in December 2008 shows a Claas Lexion 600 with a 61ft (18.6m) header working in drought hit wheat in New South Wales, Australia.
The cutom-built header was made by a company called Radford Harvesting and is believed to be the largest in the world.
You can find out more details (and watch a second video) on the Hours Not Miles blog. Thanks to FWispace forum user Laury Curran (who also writes the blog) for drawing it to our attention.