Getting Things Done is a concept created by David Allen. His methods enables to improve productivity, thanks to the use of tasks lists. There are several applications developed to apply GTD methods on computers.
Some of them are web-based, such as toodledo.com (it will probably be the subject of a future article). And other ones are available on GNU/Linux system, such as this quite new software that seems to be interesting :
Getting Things GNOME !
More informations are given in Ploum’s article. You can share your feedback if you have already tested it.