His books are now available for free at Project Gutenberg.
I especially loved the Barsoom series.
Did you know there was a 2009 movie?
Do not watch!
I mean, I guess I should have known what to expect when I saw it starred Traci Lords, but seriously... this was just amazingly awful. Not a funny MST3K kind of awful.... just bad and stupid and bad and painfully dumb and bad.
There aren't many books or movies I give one star, but I'd have given this zero stars if Netflix had that option.
So, supposedly there is going to be a John Carter of Mars film in 2012. Hopefully the trauma will have worn off enough by then for me to risk seeing it.