[R-sig-Geo] package for writing shapefiles from SpatialPolygons ?

[Michael Sumner]

Hello, I'm sorry but I have lost track of how this is to be done. Any 
vector format would do, but I guess shapefiles are the most obvious.

 Is there a "spmaptools" package somewhere for doing this?
I can't find it.

Otherwise, how can I convert a "SpatialPolygons" object to a "polylist" 
(for writing by maptools)?

Sorry if this is documented somewhere, but it's one of those things I 
had assumed could done and have only just attempted to find out how.

Cheers, Mike.