I'd love to colour code the actual Notebooks and Notes differently (not just the text in them - which I do use)
For someone visually minded, it's great to have a second tier of visually organising and archiving content. As it is, Evernote is not oversee-able enough, once you've generated loads of content. It needs to be visually instantly logical, from a wider perspective.
DTLow - yes, you get it.
gazumped - that's great about the sourcing, thanks for sharing, didn't know that!
Let's have coloured Notebooks and Notes please!