Last night I upgraded the server to a development version of Bukkit to support Minecraft 1.1. I haven't had a chance to really test it out, and I haven't looked into updating the plugins yet. So don't be surprised if you find something not working quite right -- just let an admin know if you find anything.
I do know that admins can not yet enchant bows like we've been doing with other tools and weapons; I expect that you can enchant them normally through an enchantment table, though. (There's a table in the market.) Also, I expect the disappearing oak sapling bug to be fixed, but again, haven't tested to make sure.
I'll try to find a chance to put more time into it tonight.