
Rsdio came across an interesting app note from Maxim and shared it with us. These are some PCB layout guidelines for RF and mixed-signal designs.
This application note provides guidelines and suggestions for RF printed-circuit board (PCB) design and layout, including some discussion of mixed-signal applications, such as digital, analog, and RF components on the same PCB. The material is arranged by topic areas and provides “best practices” guidance. It should be used in conjunction with all other design and manufacturing guidelines that may apply to particular components, PCB manufacturers, and material sets as applicable.

Thanks so much for this. Another useful app note I got from your link is:
Strange, the link did not turn up. Well, here it is:
http://www.maxim-ic.com/app-notes/index.mvp/id/4636
The app note is called “Avoid PC-Layout “Gotchas” in ISM-RF Products”