If the purpose of SiteBrain is sharing the structure of one's Brain that can be intuitively navigated, it is reasonable to enable tags for links and tags/icons for thoughts. As Brains grow and become more complex, these features make life much easier for the users but are indispensable for those using SiteBrains. Specifically, I'm thinking of a sharing some complex ideas via SiteBrain on the Internet with students who do not need to be familiar with PersonalBrain itself.