Is there anyway I can 'share' a document live with a colleague in another country?
We both need to be able to view and me to make changes to an openoffice spreadsheet live while on a telephone conference. I thought of allowing him to see my desktop via a remote desktop system (VNC?) but I would rather not if possible. Does service / app exist to allow me to achieve this?

EDIT: Forgot to say that he is a Vista user.