One good definition of hell: flying 16+ hours in coach. And it's antipodean opposite: flying that long in Qantas business class, which I did a couple of years ago, LAX to Auckland. Not only was I totally comfy in my near lie-flat seat with privacy screen, not only did I totally dig the mood lighting that changed as the trip went on (meant, I think to bring the body clock into some semblance of sync), but I boarded the plane with a bad cold, and I disembarked without it.
Okay, I can't credit the flight with that, per se, but I can almost promise you I wouldn't have been in any kind of reasonable condition had I flown the distance in economy.
From now until October 29th, 2009, you can get into the Qantas business class cabin to Sydney and Brisbane from LAX or SFO for $4,439, and fares from New York (JFK) starting at $4,943. (Travel from 330 days on from the reservation date.) That's about 40% off the regular fair, so if you know you've got travel Down Under up coming in 2010, this is a deal you won't want to miss.