IP: Flowcraft.net
Fish server
I wouldn't, as some servers say that they will ban you if you use cheats.
You can search for Minecraft servers on websites such as Minecraft Server List and Planet Minecraft. Some popular servers include us/eu.mineplex.com, play.cubecraftgames.net and play.hivemc.com where there are a bunch of plugins, custom gamemodes and minigames for you to check out.
No, there is not any good servers for Minecraft 1.6.6. In fact, there are no more 1.6.6 servers at all. There are only updated servers. My recamendation is for you to update minecraft. All of the servers, or the most active, always update.
To find good Minecraft servers check out "Planet Minecraft" is you look under "Servers" you can hit "Top rated!" for the best of the best. But I personally recommend PabiCarft. It is the only server I ever play on. The ip is: pabicraft.no-ip.orgAnd its website is: pabicraft.enjin.com
no you need minecraft beta to play beta servers
The VoxelBox
none citywars has custom plugins
There are some good ones at minecraft forums
A really cool server for minecraft is orcworm.co.uk.
search minecraftsp in google and download it its free minecraft but some multiplayer servers dont work
forget the question its easy theres nuke server and exploding tnt server or find some other servers in youtube the servers got site in youtube there own site is awesome so check the server in youtube or search it to play minecraft