Mostrar post relacionados

Mostrar post relacionados debajo de tus entradas para atraer a que tus visitantes sigan leyendo.
A continuacion os dejo un muy buen código fácil de configurar.
También os dejo este link donde pueden configurar sencillos anuncios y obtener ganancias de ellos:
http://www.infolinks.com/join-us?aid=2608522

Buscamos la etiqueta </head> antes de ella pegaremos lo siguiente:

<!-- Entradas relacionadas con miniatura Script y Estilo -->
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<style type='text/css'>
#related-posts {
float:center;
text-transform:none;
height:100%;
min-height:100%;
padding-top:5px;
padding-left:5px;
}
#related-posts h2{
font-size: 1.6em; /*Tamaño de la letra*/
color: white; /*Color de la letra*/
font-family: Arial, &#8220;Times New Roman&#8221;, Times, serif;
margin-bottom: 0.75em;
margin-top: 0em;
padding-top: 0em;
}
#related-posts a{
color:white; /*Color letra sin pasar el mouse*/
transition: all 0.7s ease 0s;
}
#related-posts a:hover{
color:black; /*Color letra al pasar el mouse*/
}
#related-posts a:hover {
background-color:#d4eaf2; /*Color de fondo al pasar el mouse*/
border-radius:10px;
}
</style>
<script type='text/javascript'>
//<![CDATA[
//Script by Aneesh of www.bloggerplugins.org
//Released on August 19th August 2009
var relatedTitles = new Array();
var relatedTitlesNum = 0;
var relatedUrls = new Array();
var thumburl = new Array();
function related_results_labels_thumbs(json) {
for (var i = 0; i < json.feed.entry.length; i++) {
var entry = json.feed.entry[i];
relatedTitles[relatedTitlesNum] = entry.title.$t;
try
{thumburl[relatedTitlesNum]=entry.media$thumbnail.url;}
catch (error){
s=entry.content.$t;a=s.indexOf("<img");b=s.indexOf("src=\"",a);c=s.indexOf("\"",b+5);d=s.substr(b+5,c-b-5);if((a!=-1)&&(b!=-1)&&(c!=-1)&&(d!="")){
thumburl[relatedTitlesNum]=d;} else thumburl[relatedTitlesNum]='https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbRfcw9vCgslXw3AF60DI9Kd88pCjxeFqMfkscEMIPvoTmA_Kv4F9F_pTCJhsf3BqH7ngJiHO2wMjIk2Eodr3_jA2UET98OSGWm3v1JAXfARM-RMMZRhV4bt2AA9JmebrkSUke0oNSH-Y/s400/noimage.png';
}
if(relatedTitles[relatedTitlesNum].length>35) relatedTitles[relatedTitlesNum]=relatedTitles[relatedTitlesNum].substring(0, 35)+"...";
for (var k = 0; k < entry.link.length; k++) {
if (entry.link[k].rel == 'alternate') {
relatedUrls[relatedTitlesNum] = entry.link[k].href;
relatedTitlesNum++;
}}}}
function removeRelatedDuplicates_thumbs() {
var tmp = new Array(0);
var tmp2 = new Array(0);
var tmp3 = new Array(0);
for(var i = 0; i < relatedUrls.length; i++) {
if(!contains_thumbs(tmp, relatedUrls[i])) {
tmp.length += 1;
tmp[tmp.length - 1] = relatedUrls[i];
tmp2.length += 1;
tmp3.length += 1;
tmp2[tmp2.length - 1] = relatedTitles[i];
tmp3[tmp3.length - 1] = thumburl[i];
}}
relatedTitles = tmp2;
relatedUrls = tmp;
thumburl=tmp3;
}
function contains_thumbs(a, e) {
for(var j = 0; j < a.length; j++) if (a[j]==e) return true;
return false;
}
function printRelatedLabels_thumbs() {
for(var i = 0; i < relatedUrls.length; i++)
{
if((relatedUrls[i]==currentposturl)||(!(relatedTitles[i]))) {
relatedUrls.splice(i,1);
relatedTitles.splice(i,1);
thumburl.splice(i,1);
}}
var r = Math.floor((relatedTitles.length - 1) * Math.random());
var i = 0;
if(relatedTitles.length>0) document.write('<h2>'+relatedpoststitle+'</h2>');
document.write('<div style="clear: both;"/>');
while (i < relatedTitles.length && i < 20 && i<maxresults) {
document.write('<a style="text-decoration:none;padding:5px;float:left;');
if(i!=0) document.write('border-left:solid 0.5px #d4eaf2;"');
else document.write('"');
document.write(' href="' + relatedUrls[r] + '"><img style="width:72px;height:72px;border:0px;" src="'+thumburl[r]+'"/><br/><div style="width:72px;padding-left:3px;height:65px;border: 0pt none ; margin: 3px 0pt 0pt; padding: 0pt; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal;">'+relatedTitles[r]+'</div></a>');
if (r < relatedTitles.length - 1) {r++;} else {r = 0;}
i++;
}
document.write('</div>');
}
//]]>
</script>
</b:if>
<!-- Entradas relacionadas con miniatura. Script y Estilo -->



Buscan el siguiente código <div class='post-footer-line post-footer-line-3'>

y debajo poner el siguiente





<!-- Entradas relacionadas con miniatura -->
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<div id='related-posts'>
<b:loop values='data:post.labels' var='label'>
<b:if cond='data:label.isLast != &quot;true&quot;'>
</b:if>
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<script expr:src='&quot;/feeds/posts/default/-/&quot; + data:label.name + &quot;?alt=json-in-script&amp;callback=related_results_labels_thumbs&amp;max-results=6&quot;' type='text/javascript'/></b:if></b:loop><a href='http://www.bloggerplugins.org/2009/08/related-posts-thumbnails-blogger-widget.html' style='display:none;'>Related Posts with thumbnails for blogger</a><a href='http://www.bloggerplugins.org/' style='display:none;'>blogger tutorials</a>
<script type='text/javascript'>
var currentposturl=&quot;<data:post.url/>&quot;;
var maxresults=5;
var relatedpoststitle=&quot;Posts relacionados&quot;;
removeRelatedDuplicates_thumbs();
printRelatedLabels_thumbs();
</script>
</div><div style='clear:both'/>
</b:if>
<!-- Entradas relacionadas con miniatura -->




Y listo pueden asegurarse de que este todo bien. Pero antes no se olviden de 

guardar  todo los cambios.