Advanced Media has announced that they plan to start shipping RIDATA brand Blu-ray Disc media in the first quarter of 2007. Here's part of their press release:

Advanced Media, Inc., manufacturer and marketer of the popular RIDATA brand of recordable CD and DVD media, electronic storage products, and digital media accessories, is among the first optical disc manufacturers to introduce the new Blu-Ray media in the United States. The company is now shipping the blue laser format RIDATA HD DVD-R media and Blu Ray disc availability is scheduled for the first quarter of 2007. A Blu-Ray disc holds up to five times the storage of a normal DVD with 25GB of capacity on a single-layer. It also has three times the transfer rate of a normal DVD for fast recording of large amounts of data.

To truly imagine the capacity of a Blu-Ray disc consider that it can store 25 million pages of text that is approximately 83,000 300-page books. It has more than five times the capacity of a current red laser DVD. A Blu-Ray disc will store over 4.5 hours of high-definition (HD) video or about 11.5 hours of standard-definition (SD) video on a 25GB disc. Blu-Ray technology will begin offering multi-layer discs, which should allow the storage capacity to be increased to 50GB (25GB per layer) in the fourth quarter of 2007 simply by adding more layers to the discs.
According to their press release, Advanced Media also plans to introduce 50GB dual-layer Blu-ray Disc media by the fourth quarter of 2007. More information can be found here.