Wi-Fi Download is is a feature that allows you to transfer your recordings from iRecorder to any computer, wirelessly, as long as your phone and computer are on the same Wi-Fi network. (important to note, Wi-Fi and not 3G or edge). This is done without any setup or software to install and essentially can be done very simply through any web browser. Wi-Fi download makes a direct connection from your computer to your iPhone, so there are no privacy concerns, or third party servers involved.
Note: You must keep the Wi-Fi Download screen on the entire time you are transferring recordings to your computer.