I previously briefly wrote about the OpenSocial platform which is still in it's infancy, and while some developers have been hesitant to jump onto this bandwagon, here comes a whole herd of developers and business minds alike.
LinkedIn is taking it to the next level, allowing applications to be driven and directly tapped into folks business/professional networks. Initially, only Google's own Orkut allowed applications to be developed. Within the US, this didn't mean much as Orkut is not one of the current top social networks by any stretch. I expect LinkedIn's wave to be much larger, and hit home with a lot of the tech/business minds... So, with your network of professional contacts, how would you like to tap into the power of that network to provide more value?