Ok, not 18th century PowerPoints, but there were some very interesting PowerPoint presentations about 18th century topics . . . (Doug Birk's and Peter Watts/Jim Kuehl's appear on their own pages)

Among those presenting -

Michael Galban on the Ganondagan Iroquois site and early Iroquoian artifacts

Wayne Krefting on using various types of fur trade accounting and financial documents to enrich our understanding of the period

Isaac Walters on the Religion of the Fur Trade Engagé

Tom Shaw on the sources and evolution of the distinctive Red River clothing style