For those who haven’t yet gotten into Lost yet or are planning a rewatch, Netflix has just added seasons 1-4 to their instant streaming collection. Season 5 is still available for free on abc.com if you don’t mind watching commercials. So hurry up – you have only 6 more months (give or take) until Season 6 starts!
http://www.hackingnetflix.com/2009/08/netflix-adds-lost-seasons-1-4-on-streaming-in-hd.html