Tao of Tea, and Ippodo Tea. I love the simple double-lidded tins from ToT, and LOVE the fact that I can remove the label when finished, since it is attached in a non-destructive way, and have an extremely functional and attractive reusable tin.
Ippodo, their tins are nice and reusuable. The glue is water soluble, so the labels are easily removed when finished. I absolutely adore that the premium teas come wrapped in an origami-esque paper wrapping. The highest quality comes in a small presentation box containing the tin. In the interest of reducing packaging, I'm not such a fan of that, but it is attractive.
I'm always in favor of functional simplicity. I prefer tins over plastic, due to breakage and re-use issues, and really like being able to completely remove branding/labeling when the tea is used up, so I can use it for my own purposes, or for gift-giving.