Analyse existing systems. Divide them into subideas, and mash up them. For instance, Gmail is a MUA with good spam filter, keeping e-mails in threads. So, why

Analyse existing systems. Divide them into subideas, and mash up them. For instance, Gmail is a MUA with good spam filter, keeping e-mails in threads. So, why not create a blog reader that keeps discussions between bloggers in threads, making it easy to follow?