Amazon grew from a tiny online bookstore to one of the largest stores on earth. They did it while pioneering new and interesting ways to rate, review, and recommend products. Greg Linden shared is version of Amazon's birth pangs in a series of blog articles
http://www.highscalability.com/amazon-architecture
others:
- the interview in ACM Queue(Learning from the Amazon technology platform) http://www.acmqueue.com/modules.php?name=Content&pa=showpage&pid=388
- Amazon uses Perl and Mason: http://www.masonhq.com/?MasonPoweredSites
- Werner Vogels, the CTO of amazon, spoke a tiny bit about technical details on SE-Radio. You can find the podcast under http://www.se-radio.net/index.php?post_id=157593