A while back in our TUAW Guide to Xbox 360 and Mac we mentioned the forthcoming Spring Dashboard update on the 360 was to bring updated video codec support. Well that update dropped last week and Nullriver has correspondingly updated their Connect360 software (which we've mentioned before) that allows streaming video (and audio) files from a Mac straight to a Xbox 360. The newly supported codecs include full HD (1920x1080) H.264 in both the MPEG-4 and QuickTime containers (in addition to the previous WMV). This, of course, is substantially higher than Apple TV's support for 720p video, making the Xbox 360 likely the best full HD video extender available (though the Xbox is disappointingly loud compared to the Apple TV).
Connect360 remains $20 and a demo is available.
Thanks to everyone who sent this in!