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As far as the blogoshere is concerned, I've been beaten to the punch on this one. A Febrary 19, 2010 post to the Religion in American History blog by Linford D. Fisher was titled "The View from Pachgotgoch (or, Why Moravians Are Still Sexy)".
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If Linford Fisher's post wasn't enough to convince you to read all 690-plus pages of Gideon's People, I'll just have to tell you a few other things about it.
Q: Who was Gideon?
A: Gideon was the headman of the village of Pachgatgoch, a unique community in the sense that it was a community of Christian Indians not organized by the missionaries (this is explained in the introduction, page 60).
Q: Is there any data in this book that I can use for genealogy?
A: Any of the Appendices might be helpful to you. they are, as follows:
Appendix 1 --> page 437: Catalogus of the Indian Congregation in Pachgatgoch
Appendix 2 --> page 447: Names Compoiled by Augustus Gottlieb Spangenberg
Appendix 3 --> page 451: Catalogus of Baptized and Unbaptized Indians in Pachgatgoch
Appendix 4 --> page 461: Lists and Correspondence
Appendix 5 --> page 523: Biographical List; and
Appendix 6 --> page 537: the Gazatteer (a list of geographical names)