This website for the Presbyterian Church in America (PCA) Historical Center has quite a bit for those who are interested in history and those who want to preserve their history.
By clicking on the tab for the Collection Overview, you can learn more about the archive's holdings. The homepage for the Collection Overview includes a list of organizations and individual names for with they have records. The Research Library link on this page provides a list of 19th and 20th century Presbyterian periodicals with indexes. This website appears to be a work in progress as this page shows upcoming links for their card catalog and manuscript holdings.
Under the Local Historians tab you will find resources for church historians including how to write a church history. This is a great guide for even those of other religious faiths and what better way to do genealogy then by preserving our own history? This page also provides a year by year summary of church histories that they have received and archive.
Never been to an archive? There is even an article on this website about how to research at an archive.
This website is an important resource for learning about what is available for your Presbyterian ancestors and what you can do to write history for your descendants.
Thanks to Miriam Robbins Midkiff for letting me know about this resource. Miriam has a bunch of great resources she works on including her websites Online Historical Newspaper, Online Historical Directories and her blog AnceStories