power and sample size for a GLM with poisson response variable

Hi all,

I would like to estimate power and necessary sample size for a GLM with 
a response variable that has a poisson distribution.  Do you have any 
suggestions for how I can do this in R?  Thank you for your help.

Sincerely,
Craig

Craig A. Faulhaber
Department of Forest, Range, and Wildlife Sciences
Utah State University
5230 Old Main Hill
Logan, UT 84322
(435)797-3892