It has a whole bunch of things which, well, involve entering names and then seeing entertaining stuff happening because of them. I guess there should be a mature warning, but it's nothing a bunch of over-thirteens can't handle
Let me describe a handful of them
http://en.genzu.net/sokan/ is the "correlation" generator. It generates a diagram of the relationships of the people whose names are input into it
http://en.genzu.net/buki/ is the "weapon" generator. It generates a weapon on the basis of the name entered.
http://en.genzu.net/heimen/ is the "floor plan" generator. It generates a floor plan for the possible residence of the people you've entered the names of
http://en.genzu.net/robot/ this one builds a robot design out of your name.
http://en.genzu.net/sen/ this one designs warriors
http://en.genzu.net/sekai/ this one uses the names you've input as the names of "gods" who create a world together and rates how beautiful the world is (100 is the highest).
For maximum hilarity I suggest using the display names of fellow forumgoers, particularly the more famous/infamous amongst us, and if you want to risk it, the forum staff, game masters, and the developers. Of course if they have any objections... well that'll teach you to put your real names up on the internet roflmao.
The next link is what happens when you enter the known forum names of the SK developers (as according to the wiki page) into the world generator. There's one guy missing due to not having a known current screen name and also because only seven names can be entered.
http://en.genzu.net/sekai/?n=Nick,Cherub,Boswick,Crazyoddbaa,Bifurcate,C...
expecting to get in massive trouble
I had expected faster replies to this...