I’ve written a couple of simple C18 test programs for the MiRF V2 based on the C code for the 16F88 on the SFE web site. My modules are interfaced to 18F4520 chips (QFP) on a couple of small home-made PCBs. The received data buffer contents may be checked by running the receive program under the MPLAB debugger with an ICD 2 and examining the buffer in a Watch window by setting a breakpoint.
The code is here:
http://www.leonheller.com/MiRF%20V2/MIRF%20V2.zip
Leon