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DL said...
The way most people do it:
2 pieces of 2x4 treated pine bolted vertically to the wall, 4ft apart.
Drill 25mm holes with a spade bit into the 2x4, perpendicular to the wall, angled slightly downwards, with holes spaced 40mm apart.
Insert 2ft lengths of 25mm dowel into holes.
Boardrack!
I did this for my first rack, but had problems with the dowels snapping off when you bump them accidentally

For the next one I got about 12 metres of 10mm x 100mm pine, and built two identical 'ladders' with the pine. Place the ladders 1 metre apart, with some more pine to keep them there.
Voila a free standing board rack, with ends that won't snap off.