Has anyone heard these guys?

I just caught them on a late night show.  I've been checking the internet for them and they are great.

I really like this two songs.

http://s0.ilike.com/play#Mumford+&+Sons:The+Cave:127666290:s58713725.14707359.9167190.0.2.204,std_66f404a9f0014b74bc3d2ce391870c67

http://s0.ilike.com/play#Mumford+&+Sons:Roll+Away+Your+Stone:89662720:s58713727.15069945.9167190.0.2.199,std_cbcc5fe087f942d9931b57a299acedf9

Anyway, I think that I'm going to try to find more about these guys.  I was just wondering if anyone has heard them before.