This is a pretty cool video on a NXT automatic-bridge layer.
It places the birdge down, drives over it the picks it up again.
In their description it says how they went about to make it.
Captain Greybeard was challenged to make a Lego Mindstorms Submarine.First he made a normal hull out of technic beams and placed the NXT sealed in a plastic bag.
With the bag he could watch the display and control the buttons needed... and the cables for the motors and sensorsare sealed at the seam of the bag to sael it tight
it is also possible to charge the NXT after sealing
Here is the result of his work..
Captain says.."I built two submarine, Grey November Mark I and Grey November Mark II ... The first sub is equipped with a compas sensor and a color sensor (for signaling it's state to the outside) and the second one with a compas sensor and an IRseeker. When my subs returned from Portugal I want to try that the second sub will follow the first automatically. For that purpose I will attach an IR ball to the first submarines!"
David Gilday, the creator of the Cubestormer has created a new cube solver, the Microcuber.
It is arguably the world's first robot that can solve the Microbic, a miniscule version of the Rubik's Cube.
Anika Vuurzoon has made a Monopoly assistant.
It can store the money and be a die as well.
More info on her site which also has the programming and building here.
The program can be also found here