First, they'd like to bribe you with a discount. Starting today and stretching through the game's PC launch on September 4, you can snip 20% off the $19.99 asking price if you pre-order on Steam. If that's not enough to entice you, you could attend the "Guide to Survival Horror" panel at PAX Prime next week, where Outlast developer David Chateauneuf will explain how he goes about trying to get players to wet their pants. That option has Joystiq's own Susan Arendt (that's me!) thrown in as an extra bonus. (I'm also on that panel.)
If neither of those are enough to sway you - well, frankly, my feelings will be a little hurt that you don't want to come see me - Red Barrels will also have a brand new Outlast demo on hand. If it's anything like the last one, it will make you yelp like a small dog and question the life choices that brought you to that booth.