Beyond the clear plastic, this is really just a regular, solderless breadboard. It has 2 power buses, 30 columns, and 10 rows - a total of 400 tie in points. All pins are spaced by a standard 0.1". The two sets of five rows are separated by about 0.3", perfect for straddling a DIP package over. The board accepts wire sizes in the range of 29-20AWG.
The mbed Microcontroller is made for prototyping, and comes in a 40-pin 0.1" pitch DIP form-factor so it’s ideal for experimenting on breadboards, stripboards and PCBs. It supports lots of interfaces including USB, SPI, I2C CAN, ethernet, and serial. And downloading programs is as simple as using a USB Flash Drive.