High-density computer display visualization formats provide improved visualization of large amounts of threaded information. These visualization formats are suitable for a wide variety of threaded information environments including newsgroups, threaded Web discussions, chats, e-mail inboxes, etc. In one implementation, the threaded message visualization represents each post with a generally one-dimensional or narrow entry line. The entry lines are horizontal and arranged vertically in substantially the same indented threading arrangement as the text of a conventional prior art visualization. In other implementations, the appearance (e.g., color), length, and position of entry lines can represent additional selected information while maintaining the generally one-dimensional character of the entry lines.