[R] convert opengis wkt to geometry?

[Jeff Hamann]

After writing some code (stupidly without checking to see if there was 
code to do this already) to generate PostGIS SQL insert statements for 
simple geometry (wkt), I didn't check see if there is already something 
available to convert WKT strings into some R package geometry (sp?). 
Does anyone have any advice, hints, code (?) for converting the 
following OpenGIS strings into something useful in R:

POINT
MULTIPOINT
LINESTRING
MULTILINESTRING
POLYGON
MULTIPOLYGON
GEOMETRYCOLLECTION

Jeff.