On the iPad launch day over 300,000 iPads were sold. Also on launch day iPad users have downloaded over a million 
apps and over 250,000 eBooks from the iBookstore. Steve Jobs himself said that “iPad users, on average, downloaded more than three apps and close to one book within hours of unpacking their new iPad.”
The numbers go against certain Piper-Jaffray’s analytical predictions that called for up to 600,000 to 700,000 iPads to be sold on launch day.
Sam's Blog 