Hyper9 GuessMyOS
This falls under the category of Fun Apps. I recently installed GuessMyOS by Hyper9 (who make several virtualization management apps). This is a plugin for VI3 and vSphere4 client. GuessMyOS replaces the generic VM icons with OS-specific for Linux and Windows. Personally I like seeing the penguin.
This is tied to the client so must be enabled for each client instance.
- habanero_joe