The method of Adding Help Tabs described here [Edit dashboard's help tab][1] also works for custom posts types as long as the edit-CustomPostType function (list admin screen) occurs before the CustomPostType function (edit / add new admin screen). For custom post type taxonomies use edit-taxonomyName. Cheers.


  [1]: http://wordpress.stackexchange.com/questions/77308/edit-dashboards-help-tab/