I've written up a simple project that uses the nRF51-DK to send LDR light levels over BLE using the Nordic UART Service (NUS). In the process, I have set up a cross-platform toolchain (OS X, Windows) using GCC. Hopefully this will help some like me in getting started with this chip.
You can read details below:
http://electronut.in/nrf51-adc-test/