Look at peercoin or (PPCoin). There is a lot of hype about bitcoin, and lightcoin but there are some fundamental limits the technology. I think "smart" investors are starting to diversify. This video shows presents a good case for PPC in the long-term:

Bitcoin vs. Peercoin
 http://www.youtube.com/watch?v=ZEgj_whkg08

I'd like to know what others think.