This doesn't require any software to be installed on your PC or Mac. It uses standard file sharing protocols (AFP for mac, FTP for windows) to get the job done. It uses WiFi, so you just join your iPhone to the WiFi network your computer is on and your good to go.
What if you don't have access to a wireless network? Can you use your computer to create a computer-to-computer network, and connect to that? And what about using it with a desktop? Are there alternatives to the wireless method (as awesome as it is)?
Take care,
Sojourn