Blakemiles made a similar point a couple months ago. .
My observation then, as it is now, is that "forum" type format like 4chan or 2p2 is way better than the reddit type interface that we have. Part of the reason is that you have to pick an area and thats where your post is, rather than having multiple tags. Reddit kind of handles this by having subreddits.
Also, the method of display priority in most of these forums (last activity) is a far better method to move quality posts to the front of a particular forum or tag than anything we have now.
That oauth thing is allegedly being released today, and personally, im hoping there is going to be some easy way to use it to create a phpbb type interface.