Deleting a Library
To delete a library:
Select the library and press the Delete key. When you press Delete, the library and all of its records are deleted.
Any related data fields in other libraries based on this library are also deleted.
Note  You cannot delete the Address Book, iCal Events, iCal Tasks, or iPhoto libraries. If you do not want to display these libraries, see Displaying the Address Book, iCal, and iPhoto Libraries” on page 41.