[rabarberski]

For quick access to syncing your address book, you can add a sync link to the top right fastmail page using this javascript tweak (see the wiki for details on javascript tweaks):

/* Put sync address book link in the header */

window.addEvent('domready', function() {
  twkSyncStr = "<a target='_blank' href=http://sync.howard.fm/Home/Sync> Sync addresses </a>" ;
  $('admin').innerHTML = twkSyncStr + "<b> | </b>" + $('admin').innerHTML ;
});

For an example of how it looks, see here.

This code directly calls the sync function (provided you let the sync website remember your logon details). To only go to the sync logon page, remove the /Home/Sync from the URL.