R help - Mar 2003 - SAM: Significance of Microarray Analysis availability in R

Dear all, 

I have been asked to compare the SAM method on some datasets I have.
Searching the archives and help files for SAM was not fruitful. As I
understand it is available as Excel add-in and not in R. 

I am wondering if anyone has written this (in R or S-PLUS) and would be
willing to share it or at least point me right direction. Thank you. 

Regards, Adai.