ToDo's will not show in the GTD Views because they are missing the Follow Up field values.
This can be overcome by clicking Action/Delegate/Someday and defining them, but that is kind of a pain if you have 200+ existing ToDo's.
The View's "Action" column could be modified to show FollowUpText if available, otherwise Subject. That would be a bit of work and I'd rather not chase the wrong rabbit trail if there is a better way to handle/integrate ToDo's, so I'll think/play with it for a while.
Thanks,
Chris