For the iTunes WiFi sync. and other wireless sync, Apple released the updated version of iCloud for both MAC and Windows to support the latest beta of iOS 5 i.e iOS 5 Beta 5. It backups your stuff and copy it to your MAC or Windows from your iDevices.
iCloud Add-on installer for OS X Lion. (Mac Developer Program membership is required).
This software enables iCloud features such as photo stream, Contacts, and Calendar on your Windows PC.