I'm planningto do some actual woodworking this coming weekend, in addition to other things (don't go there Mark, Rennie, Chuck, et al...). And one of the projects I'm planning on knocking out is making a wood rack for my shop. The last rack I had the pleasure to use was built by some friends during a BBQ, and I wasn't involved in the critical design phase, just the screwing it to the wall phase.
I'm planning on the basic 2x4 with gussets out from the studs rack. And IIRC the usual practice is to cut the arms so that they are at a slight upward angle to help battle deflection under load. And again IIRC it should be something like 5 degrees. SOund about right to y'all?