Open to the public, all you need to do is register on our forums and you will be instantly added to the whitelist.
You can build anywhere and assuming you are not a troll/griefer, you will automatically be given advanced abilities on the server to teleport, warp, and more.
Our server utilizes the Craftbukkit mod. We're always on the bleeding edge of recommended builds and we're already on 1.5. We currently use the plugins: Essentials, GroupManager, CraftIRC, Forum Whitelist, MagicCarpet, and WorldEdit. Some of these are Admin/OP only plugins, but if you're active in the server, we won't have a problem given pubs access to them.