David Sparks on research apps and what he calls the upcoming app revolution:

This influx of cross-linking, dynamic referencing, and the linkable chaos that these apps create feel, to me, like something entirely new, and that bell is not going to get unrung. Not only do I expect these apps to push further ahead with these tools, but I also anticipate other apps to develop in the same direction. A year from now, we are going to have some fantastic options.