LinkedIn and InMaps have partnered to create a tool that allows LinkedIn members to visualize the world of their professional connections. LinkedIn Maps groups and color codes your connections based on affinity (e.g. how your connections are connected to each other). You can then analyze the groups and label them.
From a business perspective, it is an interesting tool for understanding the scope and "architecture" of your professional network. You can then identify opportunities for community development and communication.
From an instructional design standpoint, it's another great example of the power of free web tools to analyze and visualize data into meaningful information that can be used.