One of the things that annoy me about discussion threads on a website (either a commentary section or forums) are layouts like these:

I wish I could remember a website I had come across a while back that did a great job at threads and providing readers with a "show all" link that formatted the page so that all of the comments were visible and whereby each thread was shown via indentation - i.e. each thread that was a sub-topic had its own indented area. This makes thread readability so much easier - especially for those of us on a dial-up connection who have to wait for page loads in order to read the continuing discussion. This is a perfect example of how ui design could be made much simpler through a simple script and click...