Writing SpatialPolygonsDataFrame object to an ESRI Shape File format? `

Thanks for earlier help finding the new SpatialPolygons classes..
My final (for now) question, that I can't answer from various
documents is:

How to write my SpatialxxxxDataFrame object to an ESRI Shape File?

the previous method I used was:

writeSRDFShape(SRDF, OutputShapeFileRoot)

I have both a SpatialPolygon and SpatialPolygonDataFrame objects to use
as input...

Thanks, RR

Rick Reeves	
Scientific ProgrammerAnalyst
National Center for Ecological Analysis and Synthesis (NCEAS)
University of California, Santa Barbara
reeves at nceas.ucsb.edu
805 892 2533