Add a Q/A about the differences between FreeBSD and the other BSDs.

svn path=/head/; revision=16394

en_US.ISO8859-1/books/faq/book.sgml

@@ -246,6 +246,22 @@
         </answer>
       </qandaentry>
 
+      <qandaentry>
+	<question id="differences-to-other-bsds">
+	  <para>What are the differences between FreeBSD and NetBSD, OpenBSD,
+	    and other open source BSD operating systems?</para>
+	</question>
+
+	<answer>
+	  <para>James Howard wrote a good explanation of the history and
+	    differences between the various projects for <ulink
+	      url="http://www.daemonnews.org/">DaemonNews</ulink>, called
+	    <ulink url="http://www.daemonnews.org/200104/bsd_family.html">The
+	      BSD Family Tree</ulink> which goes a fair way to answering this
+	    question.</para>
+	</answer>
+      </qandaentry>
+
       <qandaentry>
         <question id="latest-version">
           <para>What is the latest version of FreeBSD?</para>