Is there somewhere I can find some description on the proper care and feeding of 
Ruby SafeLevels?

I was going to start looking into Rails, but the notion of SafeLevel = 0 being a 
requirement is kind of a "really bad idea" (Assumption: this is still valid for 
mod_ruby) in my opinion.

But it can still be useful to work under CGI (again, assuming the SafeLevel can 
be >0) and not worry about doing something fundamentally dumb.

 From a Perl background much of this makes wonderful sense until I get to the 
SafeLevel of a tainted object.  How do you cleans such a beast?  untainting 
strings is trivial, but larger objects...  My Perl background fails me at this 
point.