They play in the Jobing.com arena in Glendale.  It's a sweet arena just a couple years old in an area called Westgate which is an outdoor mall and has some good restaurants.  University of Phoenix stadium is right there too for the Cardinals.  I saw them beat the Panthers 4-1 and we sat in section 106 row M, great seats behind one of the goals but up enough so you could see over the glass.