Samsung announced over the weekend that they've started mass producing the industry's first 1.8-inch, 64GB solid state drive (SSD). Here's part of their press release:

Samsung Electronics Co., Ltd., the world leader in advanced semiconductor technology, announced that it has begun mass producing 1.8-inch solid state drives (SSD) at 64GB (gigabytes) - the highest density SSD available today for mobile computing applications...

...The 64GB SSD consists of 64 eight Gigabit (Gb) single-level cell flash memory chips. Use of 51nm process technology permits fabrication of much smaller components, with each chip having circuitry 1/2500th the width of a human hair.
No word on pricing or availability yet. As we find out more, we'll let you know. In the mean time, Samsung's entire press release can be found here.