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Nice, very nice.
Only one small thing;

Recommend that you add padding to the left column box.
Padding is not consistent: http://primeiramao.ch/blog-2/

Another reason for having padding, is...

Line 551 in style.css - change from 85px to approximate 125px

Make sure that you change your WordPress media settings to a larger thumbnail size.
AND, you will have to upload (make new posts) to...

Sorry, forgot to mention ... it's in featured.php

In classipress 3.05.2 the images are called by the function

<?php if(get_option('cp_ad_images') == 'yes') cp_ad_featured_thumbnail(); ?>

If you replace this line with

<a href="<?php...