I would like to take a stab at this ID.  I love succulents and desert plants! This is gorgeous and I believe it is Agave 'Blue Glow'... Thought I'd send this link... Hey, but I could be wrong! [Agave and Aloe][1]



  [1]: http://myvalleynews.com/homeandgarden/healthy-beautiful-gardens-all-about-agaves-and-aloes/