Sometime in the spring I saw a demo of OmniFocus and got really excited about it. I've been doing a modified GTD with text files and folders for a couple years now and was interested in stepping up to a system with a little more smarts.
While waiting for the release I discovered something that has proven to work very well for task tracking. It's called TaskPaper and when mixed with .Mac's iDisk it's just the right amount of functionality on top of my current system to do what I had hoped to do with OmniFocus.
The core of TaskPaper is text files. If you were to open up a .taskpaper file you'd find it completely readable and not-unlike what you'd type if you were just managing the text files by hand. The app is a very light-weight text editor that has a couple features that help you sort, search, and mark items as complete in your todo lists.