Try using code like the following:
lapply(ls(.rs.CachedDataEnv), function(x) { assign(x, get(x, envir = .rs.CachedDataEnv), envir = .GlobalEnv)})
This will copy all of the variables from the cached data environment into your global environment. Afterwards you'll see your Environment pane has a bunch of new data sets with random names -- one for each Viewer tab you have open. You will probably have to open them to see which is which.
Hope that helps!