More of a blog than a letter, but: “In order to maximize brand awareness, I recommend that you brand all forms of Ubuntu (i.e. Ubuntu, Kubuntu, Xubuntu, Edubuntu, etc.) as various Editions of Ubuntu. ”
Read it here
I think its critical to focus as much attention as possible on a single brand, Ubuntu, to maximize its adoption and success. Given the already fragmented nature of Linux, why fragment a specific distribution unnecessarily?