I wish the popular e readers had apis for working with book content - skimming could be only one of the awesome enchancements the tech community could make. Among others would be tying words to wikipedia lookups or research citations to the actual content, aggregating all graphs in some sort of navigable 3d interface, page in page reading, the list could literally go on forever.

on the negative side, we'd probably have to sift through tons of crappy word cloud for your book apps.