Well, I only collect the Hardcover Guides from Games I play. But really, really special ones are in my opinion:
MadWorld: The ultimate violence Guide (waht a name
)
Bayonetta CE Guide (Sadly not in english)
Halo Reach CE Guide
Bioshock 2 CE Guide
and, I must say, the CoD: Black Ops CE Guide is really nice.
I will take some pictures for my Facebook Account in the evening. Also I will post it in my welcome-thread.