When you enter that last * it should automatically switch to a view used for testing/debugging.
Go to "Battery History"
Change the top menu to "Network usage".
There ya go!
Took me ages to track that down. It was very frustrating, as no applications seem to actually display this info in a useful manner. And even this view doesn't give you numbers of bytes, just a graph with no numbers on it.
Anyone got a way of tracking down better information?
Original post on Dreamwidth - there are comments there.