D.G.
My daughter was doing the same thing at this age. It took until she was about 13 mos. to master standing up and walking on her own. It sounds like your son is ahead of the game, some kids don't even start cruising around the furniture until way beyond 12 mos. I got my daughter an inexpensive push/walker type toy & that helped her to pull herself up from standing & walk while pushing the toy. It seems like they just do it when they feel steady enough. Boy.. once she got going she quickly went to running! I don't think you have any reason to be concerned. :)