Apple gave us smart playlists for iTunes - I wonder if the idea could be applied to Safari - 'smart bookmarks' ? For example - you could have '25 most visited sites', 'sites visited today'...
But would it be possible to go one step further and use a user's ratings of sites to suggest sites of further interest? ( perhaps like Amazon.com does when you rate a CD you own)... so after highly rating MacNN, a range of similar sites is generated, such as Apple.com, MacWorld, ThinkSecret...
Anyway, the idea just came to me. Any thoughts?