Topic: Web programming
There is a very interesting post itemizing some of the perceived shortcomings of the web over at the SpaceCollective.
Some of those problems have been addressed by researchers in the past - notable examples are Eric Freeman's Lifestreams, and Ted Nelson's transclusion (I assume this is what the author of the SpaceCollective article means by the term collage; in any case you can start using a limited form of transclusion today).