I updated the new posts script to not include topics in which you were the last poster. So after you make a reply, the thread disappears from the list. But after having it available like it was for so long, I'm sure people have found a use for seeing their recently replyed-to threads.
So, we'll vote. Let me know if you want your posts to show back up, or if you prefer that they go away after you post.
I'll probably add this to the list of user-specific feature options when I start bringing that functionality into the MySpot page.