You can confirm Multi-world support if you save all of the worlds. Run some tests Also, The Bukkit Team are also moving to BukkitDev. The new temp guidelines state that you should submit a link to your BukkitDev page here. You no longer need to follow this forum's Plugin Submission Guidelines. But do follow BukkitDev Guidelines.
already id on bukkitdev http://dev.bukkit.org/server-mods/automatically-world-saving/ EDIT by Moderator: merged posts, please use the edit button instead of double posting.
Yes, you need an external download link for non-members, also your title should be [GEN/ADMN], because those are the appropiate categories and that is the proper formatting.