We plan to use the wiki and have the language leads own the process/page. The wiki allows more folks to get access without us needing to manage a full source control system. We do have a SVN/CVS system setup that we could use but the current plan will be to try the wiki first as a couple other projects have had good success this way. We started posting i18n stats on the files there already.
http://wiki.zimbra.com/index.php?title=Translations