3 years ago I wrote a spanish gossip blog. It helped me understand a lot of things about local Google search engines from South America to Spain and also learn about how different blogging portals may help you grow your blog instead of spamming as an alternative :-).

For different reasons I had to close it and after a while start another one and redirected the traffic from the old blog to the new blog. I had to redirect also all feed readers (~8-900 in those times) and I used Feedburner to do it.

When Feedburner moved on Google servers and I successfully managed the transfer and move all my feeds to Google servers, I thought to monetize all my blogs feeds with Google AdSense for feeds.

As I subscribed to all my blogs (and I advice you do to the same with your blogs) I have noticed that the old domain feed is serving two Google Adsense banners instead of one and I think this is because of the fact that Google AdSense for feeds is serving one ad for each feed, even if one is being redirected to another.

Anyone encountered this Feedburner and AdSense for feeds curious behaviour please leave a reply.