Here is a great suggestion for “backward design” when thinking about GTD and creative work.
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Brian J. Lund 
For implementing GTD you can use this this application:
http://www.Gtdagenda.com
You can use it to manage your goals, projects and tasks, set next actions and contexts, use checklists, and a calendar.
Syncs with Evernote and Google Calendar, and also comes with mobile version, and Android and iPhone apps.