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A general description is here.
'=' within -e expression is no longer interpreted as setting an environment variable.
showMethods() has a "smart" default for 'inherited' such that
showMethods(
sweep() gains an argument 'check.margin = TRUE' which warns about mismatched dimensions.
uniroot(f, *) is slightly faster for non-trivial f() because it computes f(lower) and f(upper) only once, and it has new optional arguments 'f.lower' and 'f.upper' by which the caller can pass these.
The reporting of syntax errors has been made more user- friendly.
Fixed bug in initialisation code in 'grid' package for determining the boundaries of shapes. Problem reported by Hadley Wickham; symptom was error message: "Polygon edge not found".