The inFAMOUS demo was released about a month ago on the PlayStation Network, and in that short space of time it has managed to rack up 1 million downloads.
You can’t of missed the game, it has been one of the most advertised PlayStation 3 games of its life cycle so far, considering advertising games is something Sony seems to avoid for some reason.
With a metacritic score of 84, inFAMOUS
is not the PS3′s most highly rated offering, but it does offer an open gameplay mechanic (it is a sandbox game after all) and an intriguing karma system which allows you to play the story out in several different ways. inFAMOUS is exclusive to the PlayStation 3 games console.
The figure was released in the most recent PlayStation newsletter in the following snippet:

[...] Continued here: inFamous demo fastest downloaded demo on PSN | Just Video Games [...]