The State of Mapping APIs, 5 Years On
macslocum writes "Map APIs took off in 2005, and during the ensuing years the whole notion of maps has changed. Where once they were slick add-ons, map functionality is now a necessary — and expected — tool. In this piece, Adam DuVander looks at the current state of mapping and he explains how mobile devices, third-party services and ease of use are shaping the map development world."
Obligatory: I work at ESRI and find it hilarious that we're not mentioned in that article apart from the related video.
http://www.esri.com/software/mapping_for_everyone/api/index.html
http://en.wikipedia.org/wiki/Esri