[R] text() to label points in ggplot

[stephenb]

is there a way to label points in a graph using text(locator(1),"text")
after ggplot() or qplot() ?

> qplot(date, psavert, data = economics, geom = "line",main="jhdjd")->p
> p+opts(text(locator(1),"HHHH"),new=T)

does not work.
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