NETGEAR PTV2000-100NAS Push2TV HD-TV Adapter for Intel Wireless Display

Apple has airplay mirroring, windows has WiDi.  This is the cheapest price I've seen for such an adapter.  Please make sure your computer says that its WiDi capable before purchasing.

I've purchased another multimedia player that said it had WiDi, but unfortunately was not supported with the latest drives typically found on Windows 8 computers.  I wish I checked here before I purchased it.