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A general description is here.
new help.request() function for compiling an e-mail to R-help according to "the rules". It is built on the new utility, create.post() on which also bug.report() is based now; both thanks to a contribution by Heather Turner.
update.packages() gains an argument 'oldPkgs', where new.packages() and old.packages() get 'instPkgs'. These allow to consider only subsets of packages instead of all installed ones.