I just noticed something and I can't find out where the fault is. Is planetplanet doing something wrong? Or does the new blogger have a bug?
This installation of planetplanet says that a feed(blogger) has a new post if there is comment. For example if there was a blog posted on 8th Jan, and someone commented on it today, planetplanet reads the feeds (every hour) and shows the post made on the 8th as today's post! Imagine someone comments on a 6month old post! That does mess up things a bit and the planetplanet readers do raise an eyebrow.
I have a feeling that it is blogger which is playing tricks. In the new blogger comment feeds are also available, but it shouldn't really send a new time for the main feed. I think I will ask around on the planetplanet mailing list as to who is the culprit.
Update: It has to do with planetplanet because I just noticed that the same thing happens with typepad.com feeds too. Looks like blogger only.