No joy yet I'm afraid:
In file included from TinyRF12_Demo.cpp:7:
C:\Users\John\Documents\arduino\libraries\SoftwareSerial/SoftwareSerial.h:92: error: conflicting return type specified for 'virtual size_t SoftwareSerial::write(uint8_t)'
C:\Dropbox\SKETCHES\hardware\tiny\cores\tiny/Print.h:71: error: overriding 'virtual void Print::write(uint8_t)'
I replaced my tiny & tools directory with the ones in arduino-tiny-0100-0013.zip
Thank you for spending time on this.