I'm also using GhostDoc in Visual Studio 2008. How do I view all to-do items and if that's a function already in Visual Studio or in GhostDoc (the documentation tool that I use)?
If you are referring to TODOs that are defined with the // TODO comments, open the Task List and set it to the Comments filter.
Also be careful with GhostDoc. Always read the comment that was generated. I remember that older versions would generate comments like: "Toes the string" for a method like ToString().