Pioneer announced an 800GB High definition recorder in Japan.
Pioneer DVR-DT100 can record 92 hours in HD quality. The device can also record on dual layer DVD-R. Of course the Pioneer DVR-DT100 features an HDMI output. The EPG is provided by GemStar. Pioneer will bring the DVR-DT100 in April on the market in Japan. Pricing is not set yet.
More details in this Pioneer press-release (Japanese).
Hitachi released a while ago a 1TB HD digital recorder and Sony has the awesome X-Type with 7 Tuners.