Robin Good: The YouTube Topic Explorer is a freely accessible dynamic map highlighting the key topics and videos you have been exploring recently on YouTube.
These topics are recommended to you based on your watch history. Your YouTube video watching history can be managed here: http://www.youtube.com/my_history
A "Surprise Me" icon-button futher allows you to serendipitously discover new interesting video clips suggested by the system.
YouTune Topic Explorer: http://www.youtube.com/topic_explorer