NOTE: Be sure to install the patches to url-http.el if you're seeing any strange problems.  2.9 fixes an issue with syncing child tasks before the parent.  2.8 adds much better error logging and experimental folder support.   2.6 improves support for 3 or more levels of hierarchy, and better handling of duplicate tasks and deleted tasks. 2.4 has an additional url-http patch that is important for all users of emacs 23.3 or earlier. 2.3 has multiple bug fixes regarding synchronization and timing.  Added support for duetime / starttime thanks to myuhe!  Much better logging is possible via org-toodledo-toggle-debug.