Well in just a few days I will be whizzing off to the UK (and China) wedged in a narrow seat in a slim aluminium tube. I tell myself it could be worse - after all 'my lot' came to Australia from England in a leaky sailing boat in no doubt appalling conditions on a journey lasting many months. While they had to contend with scurvy I merely need to fight jet lag (something that seems to get worse as I get older wiser)
A quick scan of the great Googlesphere reveals some great resources - the best of which are clustered on British Airways. See here --> http://www.britishairways.com/travel/arrivelanding/public/en_gb?redirect=arrive_ready
There were once some homepathic jet lag pills that seemed to help (if you could remember to wake up every 2 hours to have one!) but it seems to have become hard to find -- ah here it is http://www.jetease.com.au/
Finally there is some suggestion that daylight lamps can also make a difference - devices such as the SunTouch Plus. Also meant to alleviate the symptoms of Seasonal Affective Disorder - those mid-winter blues which are attributed to a lack of sunlight in the dead of winter.