"John B" wrote in message
...
How would you finish the inside of the dado to prevent the particle board
from crumbling, and make it look right?

Hey John - just saw this thread for the first time today. I can't believe
you can't find shelf standards, pegs, etc. that are common shelf hardware.
They are all over. Look at Lowes or Home Depot, or Ace, or ..., or...

With regard to routing in dados - use a nice sharp bit.

--

-Mike-