We provide VMware hosted services and can host virtual appliances and JumpBoxes, in case anyone was interested.
http://www.esxhosting.com/

Eric

Now things are clear, thank you very much.
I'm sorry I can't use your software, it's really good :(
I'll think of you when I'll buy a iMac!!

Please see my other reply.

But where to I search for folders like wp contest or so? I can't find them.

A JumpBox is an entire virtual operating system and can't, at this point, be uploaded to any shared hosting provider. A JumpBox needs to run in a virtualization environment like VMware or Parallels and at this point, we don't provide any capability to migrate an application out of a JumpBox to another system.

I use the one-step installation within Dreahmost, but this is not the "jumpbox's wordpress" I'm installing, right? This must be why I can't find those folders like "content" in dreamhost.
How do I upload jumpbox in my dreamhost space?