Hey, I have http://evasi0n.com statistics including the 4th of february: 5 millions unique visitor and 40 millions page views.
Earlier, Cydia founder Jay Freeman (saurik) announced that over 4 million unique devices have already been jailbroken.
More than four million unique devices used Cydia since the evasi0n jailbreak release. (Note: due to downtime, we may have not counted some.)
If you would like to join in on the excitement and jailbreak your iDevice, you can find detailed instructions at http://iclarified.com/jailbreak.