Hitachi and LG have developed a combination ODD/SSD drive called the the HyDrive. Aside from the videos on mysterydrive.net there really aren't a lot of details yet. What it appears to be is a DVD drive with a built-in 32GB or 64GB SSD.
Here are some of the videos demonstating the HyDrive's performance:
Defect Management - http://www.youtube.com/watch?v=arde0KIvll0
Fast Booting and Multitasking - http://www.youtube.com/watch?v=Vo4CROACuq0
Game Play - http://www.youtube.com/watch?v=CWesGgPJOL8