I'm not using Toodledo right now, but I've done fine with it in the past. There are a lot of ways to do GTD with it. I have found that the simplest way for me is to have
Originally Posted by Jamie Elis
Contexts: -Projects (the - puts it at the top), Computer, Someday/Maybe et cetera
Folders: Areas of Focus
and not have an explicit connection between project and next actions, except that they have the same area of focus. You can make that connection using subtasks (with a paid subscription) or with tags. Another alternative is to use Goals for Areas of Focus and Folders for Projects. I found most of these schemes too much trouble to maintain, but others have not.
I would recommend also enabling the due date field and the star, and learning about the hotlist functionality. Used sparingly, it will help you get through the busiest days. Other fields at your discretion. One nice thing about Toodledo is that you can try out wacky ideas for fields you think might help you and not lose anything but time.