Would it be possible to link directly to the package files on http://www.zenphoto.org/pages/nightly-builds? I'd like to fetch the package directly by using wget on my server. It's much faster than via ftp.
Wete
If that is the same as download probably yes. You could also use svn generally. But note that the dev nightly is currently for 1.4.3 while the trunk one is 1.4.2.x bug fixes. On release of 1.4.3 the svn streams and therefore the nightly will switch (dev becomes 1.4.4 and trunk 1.4.3.x).
This one is aimed at our translators specifically but the base principle is the same:
http://www.zenphoto.org/news/translating-tutorial#updating_zenphoto
But I never used svn on a live server to update as I/we develop primarily on a local server.
You should not directly use the SVN for anything but testing. (even then it is not needed if you are willing to wait overnight, as nightly builds are made each night around 2200 Pacific time.) The settings of the SVN are geared for debugging.
The URLs to the files are predictable, but of course there is a new pair of files each night. So your widget would have to fabricate the link based on the date.