Appnote: AN1258 Op Amp Precision Design: PCB Layout Techniques

Microchip has just posted a pretty good appnote ” Op Amp Precision Design: PCB Layout Techniques”

“This application note covers Printed Circuit Board  (PCB) effects encountered in high (DC) precision op  amp circuits. It provides techniques for improving the
performance, giving more flexibility in solving a given  design problem. It demonstrates one important factor necessary to convert a good schematic into a working precision design”