NTT DOCOMO has released the new ""P706iμ" (that's "mu"), which the company claims is the slimmest mobile with One-seg TV on the market. The Panasonic-made "Extreme Slim" phone is just 9.8 mm thick and builds in "Osaifu Keitai" e-wallet, FOMA High-Speed, a 3-inch QVGA screen, and a 2-megapixel camera. Around JPY40,000.
http://www.nttdocomo.co.jp/product/foma/706i/p706imu/ (Japanese)

Name: Buffalo DH-KONE4G/U2DS
Category: 1-seg tuner
Price: JPY15,700
Release date in Japan: Late April, 2008

It's twice the price of the Corega CG-1SGT appearing at the same time, but Buffalo's USB tuner adds 4GB of built-in memory, and works with Mac OS X as well as Windows. You can record up to 20 hours of programming onto those 4GB, says Buffalo; the "PCast TV fro 1-Seg" playback software is inside, so just carry the dongle with you to play back the recorded shows on whatever PC is handy. Better yet, move the recorded files to a microSD or MemoryStick card via the PC, and watch the recorded content on your mobile phone, PlayStation 3, or PSP. Naturally, the device will also function as generic USB memory for storing whatever you like.

A long list of additional features includes long and short antennas, USB extension cable with dock, EPG/iEPG, digital radio (play and record), digital playback enhancements for smooth motion and clear text, scene search, color correction, "timeshift playback", forward-skip, and screen shots. Finally, with two of the units plugged into your PC, you can watch/record two programs at once, switching freely between main and sub screens.

More info: http://buffalo.jp/products/catalog/multimedia/dh-kone4g_u2ds/ (Japanese)

Name: Corega CG-1SGT
Category: 1-seg tuner
Price: JPY6930
Release date in Japan: Late April, 2008

Yokohama-based Corega hopes to have you watching more TV on your Windows Vista/XP PC with its low-cost CG-1SGT tuner. It's cheaper than the company's JPY11,025 CG-3SGTR, though lacks that model's digital radio.

Plug the tiny 14-gram One-seg tuner into a USB port, find your show, and watch on-screen or record to hard disk. Just like the big HDD recorders, you'll have EPG and iEPG program guides, news and weather data reception, fast-forward/reverse controls for recorded content, and "timeshift playback" to stop and later restart currently-playing broadcasts.

If the dongle's small antenna isn't pulling in the show, position the included 45-cm long tethered antenna elsewhere in the room for better reception. It's all powered by the USB port, so take your TV-watching habits wherever you and your laptop go.

More info: http://corega.jp/prod/1sgt/ (Japanese)