MyCraft PvP is a full-time survival server that introduces a new concept to the Minecraft server scene: karma. Help out your fellow players and they can thank you with a like. Make them angry, and they'll retaliate with dislikes. The more karma you have, the more you influence the server.

Server specs:
Intel Xeon E3-1245v2, 32 GB RAM, 2x 120GB SSDs in RAID 1
Daily automated backups to Amazon S3
99% uptime since 2011

Commands:
/vote kick <player> — initiate a new vote to kick the target player.
/vote <yes|no> [player] — agree or disagree with a vote. If there is more than one active vote, specify the player as well.
/info <player> — display stats about a player.
/like <player> — commend a player for their thoughtful actions!
/dislike <player> — call out a player for doing something you didn't like.

Read more at: http://www.minecraftforum.net/topic/2139835-