I see a couple of you have logged in, sorry for not being there to set permissions properly. I will get them set for the ones who logged in so you can build in the default world.
As for whats different:
We are mainly a survival server, but we do have an economy, and other ways to get money, like jobs, and both a server run and player run shops. When I can get it working again, we also have a skylands and creative world that anyone is above freebuild is able to participate in. Inventories between survival worlds and the creative world are not interchangeable, so as to keep the economy stable. Being a survial server, we do not allow the use of teleporting (except /home and /spawn). We have one kit, and thats a starter kit, but otherwise we dont spawn items for players.
We have a fairly small player base, but sometimes that's nice. we have updated to a current build of Bukkit, so we are 1.0 compatible, but there might be bugs.
If you would like to join, I would have no issues with placing you in the builder group, that allows you access everywhere. the ones who have joined already should have been promoted already, and if you reply here, I will add you too.

(not a whitelist, everyone is welcome

)
You can also check out our webpage for more info. There is also a map, that updates almost real time. URL: mc.mykeiki.com