If you have any of the Android based Samsung mobiles like Galaxy S, SII and tablets like Samsung Tab, then managing them could be a pain, for this Samsung has this nifty software called Kies 2.0, its a free download and allows you to easily manage your mobile stuff, there is also an option of Wi-Fi sync for selected devices. You can sync contacts, music and files easily with your Windows PC and Android phone using Kies, download the latest version from below.
Samsung regularly updates its Kies software with new version, if the download link is not working let us know in comments and we will update it asap.
Download Kies 2.0 for Windows 7 [Supports both 64 bit + 32 Bit OS]
Supported Windows OS: Windows 7, Windows Vista and Windows XP.
2012 Update: Kies Windows installer exe file can be downloaded from links in comments.