Oh, where do you find all the little artwork you put on the back, I like it. It fits the N64 and it's uniform to the NES and SNES covers. The drop shadow on the Nintendo logo is a nice touch on the red spine backgrounds.
The only thing I found was the red on the spine is slightly different from the red on the front and back but printed out I bet no one would notice.
Also a problem I have making covers as well, when putting something into a template guide sometimes a layer will show up behind, and in this case the green background layer has created a vertical line from the front red stripe to the top N64 logo on the spine, I have no idea why Photoshop and Fireworks do that but, it's an easy fix just by moving a layer over a tad.
When it comes to the Only For logos, I believe Wiggy has created some vectors to make those look more high res, I believe they would be a great addition to your template since it's high res to begin with. Same with your SNES temp.
I'm interested to see how the Controller, Rumble/Memory and Expansion Pak icons will line up on the front, shouldn't be too much of a problem, but I believe you got it perfect.
