Gmail is still in beta after many years and grew 43% in 2008. AOL mail and Hotmail need to start worrying. You definitely can tell hotmail is gradually dropping and a lot more people are using Gmail now.
Gmail users: 29.6 million (+43%)
Yahoo users: 91.9 million (+11%)
AOL users: 46.6 million (0%)
Hotmail users: 43.5 million (-5%)