The post-currency economy

I am a huge advocate of the general shift into the 21st century post-currency barter economy.

Just came upon this introduction to "bitcoins".
I don't honestly know if a different currency solves  our economic problems.  I am more inclined to the dental-work-for-homegrown-vegetables type barter.  But...
This is what our friends at MIT say.  It actually explains it in a clearer way so financially-impaired idiots like me can get it.  I am interested in what people think.