My garage walls are lined with these, keeps the bikes tidy.
I use a Topeak dual touch and am very happy with it. It's a friction mounted single pole design which is nice because it requires a very minimal amount of floor space (vs. a large base). The bad thing about it, though, is you cannot use it if you have a drop-ceiling or in a vibration-prone environment. It comes with hooks for two bikes, but if you have a tall enough ceiling you can get another hook for a third.
You should be able to get it through Roscoe Village Bikes - they use them in their showroom.