If you are a subscriber to the RSS feed, you might occasionally see posts that make no sense given the date, like this
Are you ready for Halo 2?. This is because I have forgotten from time to time that labeling/taging old posts on Blogger puts them back in the RSS feed as new. For someone as anal as I am about having meta data be correct, this is very annoying because I want to go through all old posts and make them right over time, but I don't want them to show-up in the feed. And thus I do nothing.