Spencer just wrote a brief run down on how to wire the AXE401 kit in less than 2 mins to the latest generation of XRF which has 5v tollerant data lines. There's a blob of code to test the outcome and here's all you need to wire it.
3V3 --- Pin 1
C.7 --- Pin 2
C.6 --- Pin 3
0V --- Pin 10
Full article and pics @ http://openmicros.org/index.php/articles/84-xrf-basics/188-using-xrf15-with-axe401-picaxe-board
3V3 --- Pin 1
C.7 --- Pin 2
C.6 --- Pin 3
0V --- Pin 10
Full article and pics @ http://openmicros.org/index.php/articles/84-xrf-basics/188-using-xrf15-with-axe401-picaxe-board