Excellent news, everybody! Heidi is being translated by the Minor Ja Nai fansub group. Progress has been extremely slow, but the first four episodes have been completed. And, as you can see by the first screenshot, they are in desperate need of translators. Contact them on irc (#firstname.lastname@example.org).
There are so many anime clubs and websites across America, that translating Heidi should be an easy task. This remains the one major work from Isao Takahata and Hayao Miyazaki's career that is still not available in English. And this is the motherlode, the crowning masterpiece, the landmark series that gave birth to the anime boom in Japan and throughout the world..
I have argued my case for Heidi (and Marco) fansubs, so everybody knows where I stand. And many of you have offered to help. Now I can direct you to the right people. Don't forget that you can download the "raw" Heidi episodes, so you can get to work on the translations. Do whatever you can to help.