Component rack for bookcase??

Thanks for the suggestions! By the way, has anyone used Middle Atlantic Comp Cool fans?

At least get some risers in between the components. On the cheap side, hockey pucks ( or better, the soft practice-type pucks ). Up from that, rubber/cork pads, Vibrapods, Herbie's Tenderfeet or Edensound myrtle cones with custom threads... and there's a lot more choice than that. The idea is to separate the boxes as much as possible to allow air to circulate, while at the same time providing some anti-vibration treatment. Myself, I would go for the softer, squidgier stuff, but you don't know what you like until you try.

A rack or stand is a more effective but costlier solution. Maybe you can get one custom-made to fit in your wall unit, but even better, get a wall-mounter or three for all your gear ( Target makes single and double wall shelves ) or go for a solid floor stand.