I don't know if anyone has mentioned this topic before, but I just finished an interesting experiment on my test blog in which I tried postdating some posts. In other words, I added a post and edited the timestamp to a date and time in the future just to see what would happen. The results...
Postdated posts do not publish on your blog nor feed out on your RSS feed until the exact moment that they are postdated to.
Now, I don't know about you, but I see some interesting uses for this feature (and, yes, this should be touted as a feature.) It means that I can set up a series of blog entries preset to appear on my blog at specific intervals. So, if I want to appear to be posting every Wednesday at noon or whatever, I can set up a string of posts whenever I happen to have time and have them appear literally like clockwork on my blog.
Caveat: You must have your time settings set correctly under the general options in order to gain precise control.
Anyway, just thought I'd share in case this might interest anyone else. I'm sure that somewhere there must be someone else who figured this out, but, hey, it's new to me.