There isn't an official SSD capacity contest, but if there were, Mushkin would be at a distinct advantage, having launched a 480 GB drive.
This isn't so impressive in itself. What is impressive is that Mushkin somehow crammed so much in the mSATA form factor, which is much smaller than 2.5-inch SSDs.
That alone would be cause of attention, but the SSD also has very fast transfer speeds, probably above 500 MB/s given the SF-2281 controller.
Furthermore, the company tossed in TRIM support, SMART, user-upgradeable firmware, built-in BCH ECC (up to 55 bits correctable per 512 byte sector) and various security features for good measure (ATA APM, Security Set, NCQ).
Shipments will begin at the end of the month (January 2013), for $499.99 / 499.99 Euro. Not many laptops will use the Atlas, save for truly high-end gaming systems and workstations.