Amazon sample data at "http://www.amazon.com/reviews.xml":
<reviews>
<entry>
<title> Data on the Web</title>
<price>34.95</price>
<review>
A very good discussion of semi-structured database
systems and XML.
</review>
</entry>
<entry>
<title> Advanced Programming in the Unix Environment</title>
<price>65.95</price>
<review>
A clear and detailed discussion of UNIX programming.
</review>
</entry>
<entry>
<title>TCP/IP Illustrated</title>
<price>65.95</price>
<review>
One of the best books on TCP/IP.
</review>
</entry>
</reviews>
Adapted from XML Query Use Cases