The PowerShell scrips form the src download should be included in the bin download so that you can easily install and then authenticate. Without the scripts I was scratching my head for a while.
Here is the output of the installutil process: Running a transacted installation. Beginning the Install phase of the installation. See the contents of the log file for the C:\users\Mark E. Schil...
Estimate, Recurrence, Priority, DueDate and URL are not synchronizing with RTM when set on the Task class.
It would be nice if the "Parent" property of the Task class was settable.
Most of the main namespace classes should implement INotifyPropertyChanged for better integration with WPF and other data-binding based frameworks.
Put the RestClient behind an interface.