I was wandering if anybody knew how to make a skinned ragdoll in blender 3d.

What do you mean by skinned ragdoll? Do you mean to make a character rigged for animation that can be ported over to an engine that supports ragdoll physics, a rigged character to be able to interact as if it had ragdoll physics in Blender, or rigging a ragdoll?

(Just to note, that last one was just a stupid joke....unless you really did mean that one)

Of course, I'm not familiar with Blender (I have 3DS Max), but if certain concepts are the same, then I could be of some possible help (of course, some things I definitely don't know since I'm still in the process of learning).