Noctua NH-D14 Cpu cooler
 

Noctua is well known for their top of the line cpu coolers, they have now developed a new cooler which is about twice the size of their older ones. Noctua coolers have always been quite big but this takes the prize so it is going to be interesting to see how well it performs.
http://www.rbmods.com/content/17344/specifications.aspx