TDK has announced that they've started shipping their 50GB dual layer recordable Blu-ray Disc media. Here's part of their press release:
TDK, a world leader in digital recording solutions, today announced that it has begun shipping 50GB dual layer recordable Blu-ray Disc media. Retail pricing is set at $47.99 for a 50GB BD-R (recordable). TDK 50GB BD-RE (rewritable) media will be available in the first quarter of 2007 with retail pricing set at $59.99...

..."The launch of 50GB dual layer Blu-ray Disc media is a significant achievement for this revolutionary new format and for TDK," noted Bruce Youmans, TDK Vice President of Product Research & Development. "By doubling the format's capacity, the 50GB discs provide users with the opportunity to store an unprecedented amount of data on convenient and cost-effective removable media. From hard drive backups to HD video authoring, these discs offer new possibilities." He continued, "TDK innovations such as the company's CuSi inorganic dye formulation and our exclusive DURABIS 2 hard coating technology have played a key role in enabling the achievement of remarkable capacities, fast transfer rates and revolutionary durability for TDK Blu-ray Discs."
If you'd like to read more, TDK's entire press release can be found here.