The library could be customized for the most common scenarios encountered by CHWs in the developing world (Pareto analysis will help!) and preferably equipped with voice search (see
http://www.cs.berkeley.edu/~eomer/SphinxTiny/) for quick access to content.
SD cards with the video content could be snail-mailed to all known CHWs in the field.
Nokia (catch up with Sharp !) could develop a rugged, waterproof, solar powered phone with the content preloaded (rather like the OLPC laptop) for immediate deployment by CHWs .