I've created a custom GTD implementation for my Needs...can't be used as plugin(maybe with Feng 2.) it is specific to my installation.
Here is how it looks like:(I'm not allowed to post links so replace the 'hxxp' with 'http'in the links bellow
Active Projects screen:
hxxp://manvox.com/feng-gtd/gtd-projects.jpg
Today screen:
hxxp://manvox.com/feng-gtd/gtd-today.jpg
The implementation follows closely the popular Things app for Mac and iPhone