Digital Flipchart is an add-in for PowerPoint 2007 and PowerPoint 2010 (32-bit and 64-bit supported).
With Digital Flipchart installed, brand new blank slides to capture real-time information are added during PowerPoint slide shows. Using any interactive device (interactive pen panel, interactive whiteboard, interactive projector, graphics tablet, etc.) not only can annotations be added to pre-preprepared slides, but new blank slides can be used instead of paper flip charts.
This additional information is captured directly into PowerPoint for archive, re-use, distribution, etc.
Capturing audience participation increases engagement, and contextual information heightens memory recall when reviewed.
All of this without any new interactive software to learn - it's just PowerPoint.