If you need simple LPC210x prototyping system, this project is right for you.
Despite board simplicity it has all peripheral connectivity covered including RS232 interface for easy bootloading flash memory, JTAG and other if needed. There is plenty of space on board for other circuitry, that can be wired directly on prototyping area. So it may serve as learning tool or for complete project. Author provides PCB files so that everyone could build it by himself.