Over on the Cacti & Succulent forum I participate in the questions on how to propagate succulents comes up often. And like a lot of things that have to do with gardening it seems to be shrouded in mystery for the beginner and even for some people who have experience with growing houseplants.
The truth is that it couldn't be easier to and in many cases the plant will do it on it's own. The photo below I took today of an Adromischus that I own that has a leaf rooting while still attached to the plant. The leaf had been almost knocked free from the plant while I was moving it inside for the winter.
Notice the roots that have developed from the dangling leaf, but ignore the dust on my plant :0) If you're not lucky enough to have a plant doing all the work for you can remove a leaf to speed up the process. I find it's easy to just hold the leaf by the base right where it's attached to the plant and twist and pull in a swift motion. I'll then sit the leaf in a bright area away from direct sun and let the cut heal for about 4 days. After that I'll simply lay leaf on the soil surface of the pot I want to grow it in and mist often. Again I'll keep them in a bright area away from direct sun (to avoid drying of the leaf) and once I notice the roots start to emerge I cover them with soil and continue to mist often until I see new growth. By the time new growth emerges it's time to water like I normally would and prepare the plant to move to it's regular location with more light.
In time you'll have more plants than you could shake a stick at which you could then share with friends, sell or even better- donate to charity to be used for fund raisers. Propagating your succulent plants couldn't be any easier; if you don't believe me check out these previous blog entries and see this method work with an (right-click the links to open in new window) Echeveria and a Kalanchoe. With the Echeveria I was creating back ups because the main plant had mealy bugs. In the case of the Kalanchoe it was a pleasant surprise as I had forgotten about the leaf. This method for propagation won't work with all succulents, because a lot of succulents don't have leaves, but it should work with a lot of the plants you find in your garden centers.