If you are in the market for a new task/project manager application, you might try Nozbe. I heard about it first on MichaelHyatt.com. It supports the GTD method, and has many ways you can customize your tasks’ and projects’ organization. And, of course, it is sync-able with the cloud—a must-have for a sophisticated workflow.
What’s really clever about it is its integration with Dropbox and Evernote. You can associate specific Evernote content to your tasks, and associate files in your Dropbox to specific tasks. This fine integration of the three would be very useful in someone’s workflow. Although my project management is not so tightly integrated with Evernote or Dropbox, I can see the strong appeal.
The one thing lacking is a genuine desktop app experience. From what I can see, the Nozbe desktop apps for Windows and Macs are technically just web apps (websites with a good interface) in a desktop app shell. This annoys me as it does Hyatt (when he mentions in his review that the app is missing a Preferences menu).
So, if you are a task management junky, this might be your next app to play with. But keep in mind that the to do manager you use is more important than the one you don’t. Keep running the app; don’t let it run you.