Michael Miller discusses updating the American Philosophical Society's subject guides from printed to digital format. The guides were converted to HTML and integrated into finding aids to improve access and highlight important collections. Metadata was standardized using Dublin Core, LC, and DACS formats. Examples show how the new digital guides now provide corrected subject terms, standardized call numbers, and faceted browsing for topics like genetics, Native American history, and early American history. The updated digital guides serve as portals for promoting useful knowledge of the Society's collections.