Amazon.com has added a number of useful RSS feeds to their site.
The URLs are not exactly models of simplicity:
http://xml-na.amznxslt.com/onca/xml3?mode=electronics
&bcm=Electronics%3A%20Software%3A%20All%20Software
&t=webservices-20&dev-t=amznRss&type=lite&page=1
&ct=text/xml&sort=+salesrank
&f=http://xml.amazon.com/xsl/xml-rss091.xsl
&BrowseNodeSearch=229534
but it’s good to see RSS becoming mainstream!