This is an interview that was done for the February 2006 issue of ACM Queue which focused on performance:

http://www.acmqueue.org/modules.php?name=Content&pa=showpage&pid=363

This is a Queuecast that compliments the interview:

http://acmqueue.com/modules.php?name=Queuecasts&id=3

Another interview, and this one was for SysAdmin Magazine:

http://www.samag.com/documents/s=10080/sam0606h/