Comments, questions and reviews are very welcomed.
From some other comments, it seems I'm not the only one confused. Tokyo Cabinet+Tyrant are pretty new on the scene and there isn't a lot about them in English yet. So, if you add a level of explanation to the site that seems excessive to you, people would probably find it more useful than you expect.
When scaling upwards you would generally _really_ want to scale horizontally, since the vertical scale has a limit and you can quickly reach it (plus, buying bigger machines is generally much more expensive than buying extra machines).