eWeek covers that the top 25 Killer Apps of All Time. The lists started with Electric Pencil in 1976 and closes with Firefox in 2004. Browsers take top billing with 3 entries - Netscape Navigator, MS Internet Explorer (I'd argue that), and Firefox.

Microsoft wins with 7 apps. So these killers are partly based on market sales, not necessarily innovation. Apple only gets 2 entries.

The only digital entertainment killer app, and deservedly so, is Apples iTunes. In a glaring omission there is no P2P software on the list.