Mediagate is now shipping their MG-450HD. Straight out of the box it lets you stream HD video, photos and audio from any PC on your wireless network to your TV plus you can add a SATA hard drive to it and store media locally.
The MG-450HD supports full 1080p (1920×1080 pixels) in all the common video formats: AVI: MS-MPEG4v3/XviD/WMV9 (XviD with GMC option applied not supported) WMV: WMV9, ASF: WMV9, MP4: MPEG4 Video, DAT: MPEG1, VOB: MPEG2, MPG/MPEG: MPEG1/MPEG2, TP/TS/TRP: HD-MPEG2/SD-MPEG2, it also supports MP3, OGG, WAV, WMA audio and JPG/JPEG, PNG, BMP.
It weighs 20oz, and measures 2.2″ x 5.9″ x 7.3″. It is avilable now for $228.95.