lego like modular gadgets

If you have a hi-fi a TV, cellphone, computer and digital camera you already own several sets of speakers, amplifiers, microphones, screens and cameras. The idea of modular gadgets appeals on multiple levels, from Zen minimalism to the joy of playing with Legos.

Here are some of our favorites.

 
(Ranked by user votes) Vote on and review the contenders below.
A modular gadget that consists of a base and features that can be added as you want. A BUGbase module costs $300 and each extra module will add $50-100 to the cost. Of the available modules, you can add a camera, a screen, GPS, or motion detection
Be sure to watch the video after the link to see how impressive this system is.
A magnificent device
"A modular gadget that starts as a cell phone, and can be inserted into multiple "jackets" that change its function: to a multimedia phone, a portable media player, a car sound system, a full car GPS, a bike mini-GPS and more".