Just had a search on the forum and couldnt see any posts relating to this
The new PS3 game heavy rain is not due on the PSN for demo until 11/2/2010 but Sony have hidden the demo on the PSN store
Sign up to this Sony site http://www.precinct52.com/case1117_briefing
Once you have completed the registraion it will take you to the briefing room and you need to collect 4 pieces of evidence from the wall and this will then give you a unique code to download the demo from the PSN and just click on the redeem code on the PSN to download.
The demo is 1.7gb in size so may take a bit to download
The 4 peices of you need to collect are as follows
Short cigarette (117b)
Coffee shop C (it says "diner")
117h (tyre tracks).
Information can be found herehttp://www.ps3news.com/PS3-Online/heavy-rain-ps3-demo-is-available-now-via-playstation-store/