If you truly your VA to keep diary up-to-date online collaboration tools while Google Calendar or Airset allow you to share diaries and stay organised. Lots of tasks could be explained via telephone or email, or if perhaps you prefer speaking to someone face-to-face a Skype chat using a webcam excellent for and no fee. You could even get a VA to organise your filing by sending it all to her in the mail. She can then organise it for you, set it into a cardboard filing box and mail it back for you...