By far the most comprehensive expansion dock we've come across, the Echo 15 from Sonnet plugs into your MacBook's 10 Gb/s Thunderbolt port, and then productively uses that bandwidth to hook you up with 15 connectivity options. These include a 3.5-inch SATA 6 Gb/s internal drive bay (2 TB HDD optional), a slimline optical drive (options include DVDRW and Blu-ray writers), two eSATA 6 Gb/s ports, 4-channel HD audio, four USB 3.0 SuperSpeed ports, gigabit Ethernet, and FireWire 800, each device is Mac OS X compatible. The device features two Thunderbolt ports, so it can be daisy-chained with other devices. Prices start at US $399.95.