We have recently gone with the Shelf Reliance storage systems (http://www.shelfreliance.com/). Not only is it a very efficient way to store our canned goods, it also automatically rotates them which is a problem we were having when storing them on regular shelves. The shelving units come in a variety of heights and widths.

They also sell their own freeze dried food system (Thrive) and are very pro-preparedness. In my experience they have been good folks to do business with.

Greg