Tinker.it is working on a new collection of prototyping components for Arduino hackers:
TinkerKit is an Arduino-compatible physical computing prototyping toolkit aimed at design professionals.
The interest in physical computing as an area in development within the creative industries has been increasing rapidly. In response to this Tinker.it! is developing the TinkerKit to introduce fast iterative physical computing methodologies to newcomers, and particularly design professionals.
This project is currently under development by Tinker.it! We will mostly be documenting the early stages of prototyping and user research here. This is not yet commercially available.