What's this Warmachine thing all about?

So I'm listening to The War Banner podcast (hi Phil and Mike!) and theyre talking about Warmachine. They basically did the beginers guide to the game and I have to say I'm kinda interested. Anyone out there play Warmachine? Did you like it? How does it compare to 40K?

BTW I'm posting this from my Droid (best phone ever!) so I hope this turns out ok...