Shelf Standards

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They are called shelf standards and they are available at any home horror store, hardware store, or woodworking store such as Rocklers or Woodcrafters.

http://www.rockler.com/search_results.cfm?filter=shelf+standard&submit.x=0&submit.y=0

Also the woodworking stores have jigs for spacing the holes if you want to use the pins.

http://www.rockler.com/product.cfm?page=5876

Or as the OP said you can get some peg board and use every X hole as your pin hole.