From Funkyfactory Development:
Aerodrom is an AirPlay receiver application for Microsoft Windows PCs. It lets you seamlessly stream audio, videos, photos, and photo slideshows from your iPhone, iPad, iPod touch or iTunes (Mac and PC) to your Windows PC or Windows Media Center.
AirPlay is a protocol used by Apple to stream content from iOS devices to AppleTV. It was introduced with iOS version 4.2.1 and is available since then.
All devices must be on the same LAN and/or Wi-Fi network.