When it comes to map mashups there's no doubt that Google Maps leads the way. On ProgrammableWeb we list 1,964 Google Maps mashups, almost four times as many as any other API. This popularity makes utilities built on top of Google Maps especially interesting, such as this contextual menu control, which pops up a menu when the user right clicks.
Apple took a big leap of faith today and open sourced Swift, its new programming language. Apple believes developers can help make Swift a better resource as well as expand its compatibility to more platforms. Swift is available for free from GitHub with an Apache 2.0 license.