Feature request

Writing a post today, and I mentioned ‘comments’, when the thought occurred to me that I should explain what a comment is to a casual user. It then ocurred to me that it would be a great feature if you could highlight a word like Comment and add an info box so when a users cursor moves over that word, a brief explaination appeared.

If a small number of these info boxes could be added to a future version, with an admin feature to add them as required to explain WordPress features, that would great.