I just use my two Gmail accounts everyday, and happen to login to both accounts all time. But today I noticed a new thing which I surprised me. And after Googling I found it to be real. What surprised me is that "You are currently using 407 MB (9%) of your 4091 MB." at the bottom. I don't remember the last time when I looked at this message, but I know that was when it was showing 2900 odd. And I think this has just another up by about a GB.
Anyway, Gmail is offering me much more that I would expect. Thanks Google.