I just posted on the CLR Team Blog about this: http://blogs.msdn.com/clrteam/archive/2009/05/14/why-is-appdomain-appendprivatepath-obsolete.aspx

I’m trying to figure out what criteria I will use when determining when I post contents here, and when I post them on the CLR blog.  I’ll definitely post links here if I put content up there.