Didn't look deeply into SPI, but, considering they're both supported by the AVR feature set (look at the datasheet on Atmel.com), it ought to be simple. The thing about Arduino is that there are only so many pins available for expansion - so you have to give something up. My question is - WTH do you have to give up analog pins - why not digital? Anyhow, here's a guy who's been through it :
http://www.neufeld.newton.ks.us/electronics/?p=241
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