GTD – para ver y probar software
video de explicación
http://jolaus.com/gtd-mapa-conceptual-actualizado
software: things (MAC)
http://culturedcode.com/things/ipad/
software: vialist (online, pago, version free)
http://www.vitalist.com/
GTDtab (free)
http://www.gtdtab.com/
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I would recommend checking out http://www.Gtdagenda.com for an online GTD manager.
You can use it to manage your goals, projects and tasks, set next actions and contexts, use checklists, schedules and a calendar.
Syncs with Evernote, and also comes with mobile-web version, and Android and iPhone apps.