Thanks, Ebbie, we've got Tlingits down here in Seattle! Though I've never met one here who was fluent in the language. But the hope that such might come to exist is, I'm sure, the reason the Seattle Public Library stocks so many Tlingit materials (they have multiple copies of the textbook, which comes with tapes; the fourth edition, which I haven't seen yet, is on CDs). I just wish the SPL would be equally supportive of Lushootseed, which is in worse shape speaking-community-wise than Tlingit, as well as being more "Seattle".
FYI, the other Tlingit books I've seen from SPL are Haa Tuwunáagu Yís | for Healing our Spirit: Tlingit Oratory and Haa Ksteeyí | Our Culture : Tlingit Life Stories, both edited by Nora Marks Dauenhauer and Richard Dauenhauer.