I've been waiting for this (as well as my 5 year old son). The demo's now available to download for the PC.
I'm also thinking about getting this on the Ps3 so i'm hoping that maybe the psn will have a demo very soon also.
LEGOÂ® Indiana Jonesâ„¢: The Original Adventures DEMO
I'm going to give the gamershell link as well cus their servers are fast.
Demo Versions: LEGO Indiana Jones: The Original Adventures Demo - Demo Movie Patch Download Section - GamersHell.com