I am the co-owner and head admin of the Minecraft server; Server88.
It is pretty much a private server. It is white-listed 1.2.4 craftbukkit server, running various plugins. We do not have many active players, but we have a large world with the catacombs dungeon system, mob arena, mcmmo, and several more plguins to make the game play more interesting.
Our server is hosted on a Ubuntu 11.04 VPS with a 20 gig hd, 2 gigs of RAM, 500 gigs monthly bandwidth, 100 mb/s upload and download, and duel Intel Xeon E3-1240 processors.
Post here if you are interested in joining!