With the help of Arne’s Google XML Sitemaps plugin you can easily create a Sitemap for Google Webmastertools and check your blog for any inconsistencies after Googlebot re-indexes your site. I was presented with some easy to fix 404′s, which resulted from an earlier permalinks structure. The next thing was to remove the “post feed links” and “trackback-URLs” from the Google index to avoid duplicate content.

You can tell Google not to index a certain URL by applying rel='nofollow' to the link. Open single.php from your theme’s folder and replace

<?php post_comments_feed_link('RSS 2.0 Feed'); ?>
with
<a href="<?php echo get_post_comments_feed_link() ?>" rel="nofollow">RSS 2.0 Feed</a>

The trackback-URLs are easier to fix. In my case they came attached with

rel="trackback"
to which I added a ” nofollow” so it resulted in
rel="trackback nofollow"

Repeat this procedure with all the files with “feed” and “trackback” URIs and upload them to your themes folder. Finally, wait and let the magic happen.