For $60 I picked up an "Expedit" shelf from Ikea, it turned out to be too deep for where I wanted it...soooooooo
Good excuse to cut stuff!
I cut it down the middle and wound up with two 8" deep shelves that fit perfect.
Note: the backs of the new shelves look very unfinished, if that bothers you don't cut it! Up against a wall you cannot tell.
I used the shop and great table saw at http://makerplace.com/ to do all work.
Step 1: Mark Centers
Mark each shelf top/bottom piece, and upright on the center. I wound up taking out a shelf and not using the bottom piece for a different look.
Step 2: Cut It
With a good quality, high tooth count blade, use a table saw with properly adjusted rip fence to cut on your center marks. If chipping occurs try masking tape all along where the cut will be.
Step 3: Add Shelf Support
Now you have two piles of identical pieces, 1 pile for each new shelf. Assemble each shelf with ikea hardware.
The backs of the shelves now need some support, I added finishing nails through the uprights into the shelves.
Use long screws to attach top/bottom portions.