Would be great if a user can access the TinyURL for confluence via convenient way. For example adding a button to the page metadata may be the best way to go. page-metadata.vm
When user clicks on the button, a pop-up containing the tinyurl of the page appears. S/he can then copy and paste it to use for sending emails or other.

Easier than each time needing to go to Tools->Info to fetch the tinyURL.

Overwriting the TinyURLServlet may be just far too hard to have the tinyURL of the page displayed in the actual browser's address bar.

         httpServletResponse.sendRedirect(GeneralUtil.getGlobalSettings().getBaseUrl() + "/pages/tinyurl.action?urlIdentifier=" + identifier); 

Clearly, other page information may be contained in the pop-up !