Well, if you already have rackmount equipment, and you can find the ears, then you're good to go, but I thought I would point out that most Cisco equipment I've worked with has had the ability to mount the ears on the device rotated 90° specifically so that you can mount it directly on a wall.
Yeah, and that's what I got with the switches, but as you can see in the guide Trevor linked to, the brackets are rectangular.
Use only two holes on each bracket Matt. It'll be plenty strong enough with 2 -4 brackets used.
I'd be fine with two holes, but the brackets are rectangular, so wouldn't that mean only one hole would be usable?