Why is Gmail still in beta?

So, why is Gmail still in beta? Its a mature product. They've just come out with a "new version" with some substantial interface updates (these are being phased in, but fairly quickly) - for anything else, they'd call it version 2.0 - even for a web app, this whole beta thing is ridiculous. A quick check of Wikipedia reveals that it has been out since April 2004, and open to the entire public since February of this year. (which might explain the periodic "Google outages" I suffered last winter - that and YouTube must have put a strain on even Google's servers). Gmail is offered as part of a paid service (Google Apps). Anyway, the entire point of this is, it is ridiculous on multiple levels that Gmail is still in beta. Google, take the silly tag off the graphic, and have a grand unveiling. My two cents for today.