This is one of my favorite organizing ideas for under sinks. You can buy these lazy susans almost anywhere and they are great for creating order under your sink. Be sure to measure your space before you buy--they come in a few different sizes. Also, clean out under your sink beforehand and get rid of any excess cleaning products, etc. When you need to reach in and grab something, just give it a spin to find what you're looking for.
I am now a stay at home mom but in my former life I was a French teacher--I have my B.A., M.A., and A.B.D. (next step to Ph.D. in French literature). I love teaching and miss it but in the meantime I am enjoying operating a part-time home organizing and design business. Contact me for more info if you are interested!