As someone who is 6 foot 3 inches tall but too cheap to buy a first or business class airline ticket i was very interested to read an article on GeekAbout.com for The 10 Most Comfortable Airline Economy Seats

Their winner was Virgin America which is consistent with other reports I have heard. My only quibble is that they list United Airlines, but be aware that they are talking about the more expensive economy plus ticket. One of the worst experiences I have had with an airline seat with no leg room was in an economy seat on United from Hawaii to California.