So we were pretty bummed in our early testing of Amazon's newly HD-enabled Video On Demand service to find that it only streamed stereo audio instead of full 5.1 surround, but it looks like that's actually device-dependent -- we just tried it out on our TiVo HD, and movies play back in Dolby Digital 5.1. Yeah, that's still no Dolby TrueHD or DTS-HD, but it's definitely a vast upgrade from the sad two channels we got off the Roku Video Player. So why the difference? The TiVo doesn't stream content like the Roku -- it actually downloads a video file and plays it locally from its hard drive. That means that in addition to surround audio, we also saw a pretty dramatic increase in picture quality over the Roku -- not exactly Blu-ray, but at least on par with the Apple TV, which also downloads content locally. Sure, downloading first means playback can be much slower to start, but we'll take the delay over a blocky image any day. Our only gripe is that the TiVo interface is far less attractive and workable than the Roku's -- although it has a search feature, everything seems a little clunky and thrown together, and the UI just feels plain slower. Overall, though, it's hard to see TiVo owners complaining about this upgrade -- check out a hands-on video after the break.

After months of leaked testing images and rumors, Amazon's finally updated its Video on Demand service to HD. 500 shows and movies will be available in high-def to start, and the service is expanding to include Panasonic VIERACast TVs in addition to Series3 TiVos, the Roku Video Player, and the Sony Bravia Internet Link. Head to head with the Apple TV, the only downside we see is that audio is stereo-only and not 5.1, but we're super-picky like that. Rental pricing will be between $3.99 and $4.99 for HD content, and the service should be live on all devices today -- let us know when you get the update. Full release after the break.

Apple's flood of announcements this month continues apace today with the addition of high-def movie purchases to the iTunes Store. Although HD TV shows were previously available to buy, HD movies were rental-only until now. HD flicks will cost you $19.99, and we're guessing they're the same H.264 compressed 720p quality as usual, so videophiles will probably want to stick to Blu-ray. Purchases will come with both an HD file and an iPod / iPhone-ready SD file, which is a nice touch, and Apple's also promising that HD rentals will now be on the store within 30 days of retail release -- better, but not perfect. It's all going live today with exclusive pre-orders of Quantum of Solace and Twilight, but honestly, we're still wondering when Apple will implement subscription video and really take it to Netflix.

We've no way to confirm at the moment, but if SamsungCentral is to be believed, Samsung's newly announced OmniaHD will soon become the world's first cellphone to record 720p video. Unlike the HTC Touch HD -- which had precisely zero high-def amenities -- it seems the next breed of Omnia may actually live up to its moniker. Other purported specifications include an 8 megapixel camera and a 3.7-inch AMOLED display, though the resolution of the panel is currently unknown. Have we mentioned we can't wait to get our paws around this? Because we can't.

We've already seen a multimedia processor that can deliver the HD goods to our cellphones, but Nokia is looking beyond the display and hoping to cram HD recording abilities in, too. According to Nokia's Chief Technology Officer Tero Ojanpera, HD recording on a handset "is coming," and he noted that "technically, it is just a couple of years away." Analyst Alan Brown of research firm Gartner chimed in to say that some eight- to ten-percent of all cellphones could actually have HD video capabilities by 2010 or 2011, but he also suggested that the chances of those percentages growing larger than that within the aforementioned timeframe were slim. Still, we can't help but be intrigued by the possibility, but hopefully Nokia (and the rest) will learn a thing or two from the shortfalls exposed in the diminutive pistol-grip HD camcorder segment.

We just babelfished a bit more information out of Japan this morning on JVC's new high definition Everio camcorder. JVC confirms that their hi-def HDD cam will feature a trio of 1/5-inch CCDs like their GZ-MG505 camera and will shoot 16:9 at 1080i like we had assumed. So if you need to shoot in 1080p and can afford it, well, you'll just have look elsewhere. The new Everio will also be the first to slap on a FUJINON lens presumed to bring a 10x optical zoom judging by the print 'round the ring. We expect to see some working prototypes on display at CREATEC Japan where more information will surely roll.

[Via Impress]