The deserttropicals.com has some info on care and cultivation. I don't know if the second is the crassula lycopodioides. It is too hard to tell in the picture without an upclose clear picture of leaf sets. You might want to take another picture using the closeup setting if you have one. Then you could get a better id.

Larry, It sounds like a Bryophyllum, which are related to Kalanchoe. Picture - load your picture up to a photo-hosting service, like PhotoBucket or Flickr. Once the picture's there, get its 'a href....' code (copy it from the site and paste the code in the body of your message here) and hit 'Preview' - your pic should show up. In the interests of full disclosure, if it is a Bryophyllum, it's considered by many to be a weed, (particularly in Mediterranean climates, where it grows faster than inflation), but what do many know?

And I forgot to mention this plant does not appear to have high light requirements, when I first got it I placed it in a shaded south window when I checked on it a few days later it was almost completely brown. Now it is a distance away from a window under uv light and it seems to have regained all but a little of its color. I also sent a nether pic if it helps...

'Soil specifically for succulents' (I am assuming it's bought as such, not mixed by you), may not be good enough in the long run. It usually contains too much peat and water-retentive. You may have found something different - but this is what comes out of bag most likely. It may also attract bugs, mainly annoying fungus gnats. Pebbles at the bottom will keep water below another substrate (in your case - succulent soil) - if it drains well. But if the roots reach it, they may get too much. Sitting water also stagnates and there could be an unpleasant odor. This is worst case scenario - I am just pointing out what is usually forgotten and 'complicates' care of the plants. Is there some kind of barrier between the rocks and soil? If not, soil will eventually find it's way down between the pebbles and they become really 'good-for-nothing'. Of course, it is your plant-planting. They look really good most of the times, but long term could be little different. I don't want to spend time with so many extra take 'care of things' that could be easily eliminated at the potting time. JMO. Sempervivums grow best outdoors, they are very hardy. They will grow indoors, but may not look that great. They like lots of sun and appreciate some cool weather (wintertime). Rina