MLM / HLM diagnostics

Hello,

Is anyone aware of any R packages for doing MLM diganostics, such as those
suggested by Hilden-Minton (1995), Snijders & Berkhof (2007), or  Zewotir &
Galpin (2005)? I'm curious if an implementation already exists or if I'll
need to write my own.

Thanks for your time and help!

Alex Whitworth
whitworth.alex at gmail.com