We have a lot of communication tools -- email, social networking sites, blogs -- that exist in silos. There are some attempts to integrate all of it. For example, there are tools that put blog posts on Twitter and Facebook, Facebook posts get Twittered, and vice versa.  But we're still dealing with clunky mechanisms that preserve the silos.  Collaboration tools are their own silo.  Google Wave is a set of products and protocols that truly integrate email, social networks, blogs, tweets, and probably whatever is coming next and are built on the idea of real-time collaboration.