I have a small request to make for future updates to IPB (hopefully 3.0.1 :P).
I would like to see the option to change the default post view threshold for members, as discussed here. The default is "Currently viewing all posts", but I would like to be able to change this to a custom threshold of "Hiding all posts below -3 points" by default (or however many points you choose).
This would be a great way for the community to actively moderate topics, by negative voting on unsuitable posts. Once enough negative votes have been made, the post will be hidden. Sort of like "burying" on Digg.