
The software included with the Mobile I/O will run under Mac OS X.
Mobile I/O is about the same size as a laptop computer and only one rack unit high, making it right at home in the studio, and the first choice for the field.
Mobile I/O 2882 provides on-board low-latency signal processing for seamless foldback mixing in tracking.
Mobile I/O 2882 supports simultaneous input and output of all the major audio standards: analog balanced & unbalanced (Mic, Line & Instrument), S/PDIF, AES, ADAT® Optical & IEEE 1394.
In addition to 8 line-level outputs, each Mobile I/O 2882 provides an independent stereo headphone mix and output. Analog inputs and outputs are all 24-bit, 96kHz compatible. The Mobile I/O Series provides wordclock input and output allowing transparent professional interfacing of multiple units for larger systems. Mobile I/O is fully modular and interoperable. All units support 400Mbs operation, and overall system support will run up to 128 total channels of 96k audio. Support for up to 256 total channels of 48k audio is also possible. Units may be mixed and matched for optimal I/O and processing configurations.
Screenshots
Metric Halo Mobile I/O (front)

Metric Halo Mobile I/O (back)

You can buy it at Sweetwater.com for $1495 or $2095 for the DSP model.
http://www.sweetwater.com/store/search.php?search=Mobile+I/O&action=search