For completness of this thread, here is the code that I am now using with 
node 0.8.x:

var callbackHandled = false;

var readStream = fs.createReadStream(source);
var writeStream = fs.createWriteStream(target);

var onError = function(error) {
if (!callbackHandled) {
callbackHandled = true;
callback(error);
}
};

readStream.on('error', onError);
writeStream.on('error', onError);

readStream.on('end', function() {
writeStream.end(function() {
if (!callbackHandled) {
callbackHandled = true;
callback(null); 
}
});
});

readStream.pipe(writeStream, {end: false}); 

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