When Flatrates Are Not Flat

What happened to the "flatrate" or "unlimited" tariff which was truly flat or unlimited? No matter what you did you paid a flat fee per month. Is 30 MB of data traffic these days a flat-rate? According to Dean Bubbley over at his Disruptivewireless blog, some companies think so. I am looking forward to the first "true flatrate" and a "real flatrate" or a "flatter than other flat rates" etc. etc.