Tradescantia zebrina is a great beginner plant, as well. It has the advantage of being colourful, which many medium-light 'easy keepers' aren't. It roots so easily from cuttings that even death is a minor obstacle. If mine ever starts looking a little sad I just chop it up and start again. The success rate for cuttings stuck right into the soil is near 100%. Places like Home Depot sell them and they're usually cheap. I think I got mine for about $4CDN and it's since spread many offspring to sister offices and coworkers' homes.
Schlumbergeras are great, too. (Thanksgiving cactus, in particular.) They are unfussy and produce showy flowers reliably, so long as they experience a natural variation in light across the seasons. Nurseries usually start selling them around November, but they root so easily from cuttings that you might be able to get one for free from a friend. Just make sure you let the cut part callus over before planting it.
Most other succulents are great beginner plants IF you have strong light and the discipline to avoid overwatering. Because my apartment lacks south-facing windows, none of my windows are bright enough to keep them happy unless I supplement with a grow light.
