For implementing GTD you might try out this web-based application:
http://www.gtdagenda.com
You can use it to manage your goals, projects and tasks, set next
actions and contexts, use checklists, schedules and a calendar.
A mobile version is available too.
As with the last update, now Gtdagenda has full Someday/Maybe
functionality, you can easily move your tasks and projects between
"Active", "Someday/Maybe" and "Archive". This will clear your mind,
and will boost your productivity.
Hope you like it.
