I think HUKD should add a follow/favourite/like button to posted items. That way if you are interested in something you can follow/favourite/like that post and come back to it later. All your favourites/likes and follows could be displayed the side like the recent activity information is.
As far as I know the only way to do something like this at the moment is to post a comment on a post you want to follow or subscribe to the comments.
I think it would make a great addition to the website.