My standard cutting rulers are in a stand with grooves. It sits on my cutting table. I have a couple of specialty cutting rulers that are stored in a drawer.
My quilting rulers are stored in a drawer unit right by my Sweet Sixteen. The ones that I use the most (straight, various arc rulers, a couple of circles, and waves) are in the top drawer on edge in one of those grooved ruler holders (extra wide grooves to hold the 1/4" thick quilting rulers). I can open the drawer and grab the one I want very quickly since I can see all of them immediately this way. Others that I only use occasionally are stored flat in the next drawer down. I keep the keys taped to the ones that need them.
Rob