Monday, December 9, 2013
Teensy 3.1 ARM cortex M4 dev board
Loading code into the Teensy is accomplished via a boot loader, much like Arduino. So, no JTAG/Debugger required. Also, the website mentions that the Teensy boards are "mostly" compatible with Arduino sketches with the Teensyduino plugin to the Arduino IDE.
There are several USB examples for implementing various USB interfaces. Keyboard, mouse, serial and HID are available.
The teensy 3.1 is $19.80 and is available here, check out the other Teensy boards.