I've been using this dual buffer for a while for 5V to 3V and vice versa:
SN74LVC2G07DCKR	
DIGIKEY: 296-13495-1-ND


It's a dual non-inverting buffer with open drain outputs.  The supply 
voltage sets the input thresholds while the pull up voltage sets the 
output high voltage.


>>
>> I use a home grown proto board (5V) with a PIC16F88 
>> w/bootloader and a Max232 chip to load programs via the pc serial port.
>>
>> I would like to communicate to a TI CC1101 chip via SPI. The 
>> TI CC1101 radio chip has voltage range of 1.8V to 3.6V. Does 
>> anybody have a simple level conversion circuit or a favorite 
>> chip they use to convert the 5V to 3V and vice versus ?
>>
>>
>> Thanks, 
>> Kevin

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