By the way, why is there no place to talk about minecraft?
Like an section for it in "Other Games".

Whatever. 1.8 is out.
Craftbukkit is on 1.6.4 (safe build)

Does anyone know what are server admins supposed to do, like another whole program, or a way to implement a minimum of security with core server?

i know! i do enjoy minecraft haha. i run my own little server for me and my friends / family on 1.7.2. i was the first player out of us so i picked the version and 1.7.2 seemed to have the best mods except for maybe 1.6.4 but you sacrifice some features for that.

I had a whole cool setup that included
-log plugin loggin almost everything to MySQL<
-all the suite of other usefull plugins, where everyone that could use MySQL were usint it
-a view-compilator demon (I could say), which was simply a PHP class I built to run through these millions of log lines and seek what was needed to put that on some view tables (running once every minute, checking only new changes)
-and on the website I built for the game server, stuff was showing in deep details. never finished it, but it was working, in what I could call a beta state. (you can follow the link on my profile)