Document imaging is a smart way to address document research. I have always said that the most important part of document imaging is making it easy to get your documents into a research application. There’s other applications like Nuance PaperPort and Filecenter that are more robust solutions, but they are also applications with costs associated with them.
NAPS2 Is a free application [open source] that allows you to quickly convert your scanned documents into PDF’s. In addition to being able to scan documents into a PDF format, the application also has the ability to OCR them, making them searchable. NAPS2 also allows you to set up/configure multiple profiles for scanning documents. It supports flatbed scanners as well as ADF scanners.