heres a site that lets you try out software before you buy
I thinks all developers should jump on board not only does it mean less cost on sending out demos etc.. but also should lower piracy (a tiny amount)
what it is once you register you reserve a time at which point you can try out the product
The site that lets you try instruments out is www.try-sound.com. I agree, it's an awesome service and I hope to see more developers using it. Soundsondemand.com sells libraries that you can download, like single instruments from Chris Hein Guitars, Bass, etc..