Apple ThunderBolt To USB 3.0 Adapters
ThunderBolt's rival - SuperSpeed USB 3.0 - is finally getting serious traction in the computer market. USB 3.0's 4.8Gbps vs ThunderBolt's 10Gbps bandwidth may seem a significant difference, but frankly alot of computer peripherals DON'T NEED TO or can't even begin to fill the USB 3.0 pipe - let alone twice that with ThunderBolt's 10Gbps pipeline. A ThunderBolt to USB3 converter is most likely to appeal to Mac users with early models of Macs that have ThunderBolt but only came with USB 2.0 ports.
ThunderBolt USB 3.0 Adapter - Hub
The only currently shipping ThunderBolt to USB 3.0 solutions are from Matrox and Belkin with their multi-port adapters. But there's no standalone ThunderBolt to USB 3 adapter on the market at this time. With three USB 3.0 ports (versus Matrox's single USB3 port) the Belkin Express Dock has the technical advantage for connecting more SuperSpeed USB 3 devices.
Belkin ThunderBolt Express Dock
8 Various Device Ports Total
USB 3.0 vs ThunderBolt - A False Either/Or
This isn't an either/or game. BOTH of these high-speed peripheral interfaces have their place in the technology marketplace. USB 3 and ThunderBolt ports will exist side by side, and both will have thier best uses. USB 3.0's low-cost and backward commpatibility with legacy USB 2 speed devices is just too compelling a benefit for the consumer, so USB ANYTHING won't face the adoption hurdle ThunderBolt needs to overcome. USB ain't going anywhere, and Thunder-Bolt ain't going to 'kill' it. As we've seen with many computer interfaces over the years, they co-exist and sometimes ubiquity wins-out over specs and technical 'superiority'.
Apple is currently shipping T-Bolt equipped iMacs and Mac mini's to follow the initial debut of ThunderBolt MacBooks. There'll probably be a healthy market for USB 3.0 ThunderBolt adapters and converters to bridge existing backup drives and USB 2.0 accessories to the new USB3 standard via ThunderBolt ports. By year's end the cylindrical Mac Pro will be released with 2nd-generation, 20GBps ThunderBolt 2.0 ports.
Intel - and by extension - Apple stalled adoption and incorporation of direct USB3 support into Intel's bridge chipsets until sometime in mid-2012. This gave the two companies plenty of time to try to get millions of ThunderBolt ports out onto the market - before they started to USB 3.0 SuperSpeed support across all Intel's CPU chipsets.