I saw that one at Amazon and I stayed away because I couldn't find any information on the Class? I was under the impression that a Class 6 was optimal but I think the current 4GB card I'm using is only a Class 4???
I ended up ordering this one - 16GB
http://www.amazon.com/gp/product/B0026L7DGA
I'm not sure how big we really need. I realized this morning that I've spent hours now fiddling around with this machine that is probably 92% of the time an Angry Birds game player.