This link talks about compensating Op-Amp/Buffer Combonations. the idea of placing a R/C network from the Input of the Output stage or Buffer IC to the Output is used alot by IC Op-Amp Manufactures. Another interesting point and One I myself advocate is a small series resistor between the Op-Amp's output and the Buffers input. http://www.e-insite.net/ednmag/archives/1996/042596/09df3.htm