Just found a good looking GTD application via another Jackens Blog. I must admit that it looks a good app and is right up to date, created in Ruby.

Even though I am only starting with the GTD book and methodology, I will provide information about all GTD applications that I come across. As soon as I have finished the book, I will be reviewing all of these pieces of software as I find one that I can use on my 17″ MacBook Pro.
Here is an excerpt from the website.

Tracks is a web-based application to help you implement David Allen’s Getting Things Done™ methodology. It was built using Ruby on Rails, and comes with a built-in webserver (WEBrick), so that you can run it on your own computer if you like. It can be run on any platform on which Ruby can be installed, including Mac OS X, Windows XP and Linux. Tracks is Open Source, free and licensed under the GNU GPL.

The main page shows all your actions sorted by context, but you can also view pages showing just the actions in one context (for when you want to focus on your office tasks, email or errands), or just the actions in one project. You can add as many contexts and projects as you like, and drag them around on the page to change the sort order, so that your more commonly used contexts and projects are at the top of the page. Projects can have attached notes, as can individual actions.

Follow THIS LINK to visit the website and check it out for yourself.