Sony put out some facts about the UC2 Beta:
In one week, the Uncharted 2 demo managed to have:
The demo is currently #1 out of the top 5 demo first-week downloads to date, and is on a trajectory to become the most downloaded demo on PSN, ever. You can add to that number right now by visiting the PlayStation Store.
Source:
http://blog.us.playstation.com/2009/10/uncharted-2-among-thieves-by-the-numbers/
That's simply amazing!