Soon you can get your hands on the Mobot modular
robot for a very reasonable $270 a module (pre-orders
available now). A number of connection plates and
attachments will also be available, and I
guess you can 3D print your own stuff.
I like the gripper that is powered and controlled by the
rotating faceplate. I am sure the same concept can be
used to 3D print some cool things in the future.
A connector would be an awesome thing and definitely
worth a price of some sort.
In general, it seems to be a very competent modular
robotics system. It uses a snap together connector,
making it simple and fast to use, but maybe not as
strong as a system that screws together.
There is a Graphical User Interface RobotController,
and you can program it with the C/C++ interpreter Ch
so everyone from beginner to hard core hacker should
be able to do some really cool stuff.
More information and Specs on Barobo.com