mLink has started shipping it's new PCIe expansion chassis running over Thunderbolt. The upgrade basically allows for a PCIe upgrade on any Mac, not just Mac Pros. Users can add high-end video capture, networking, or storage cards to their MacBook or iMac, for example.
The mLink is equipped with two 10 Gb/sec Thunderbolt ports and can be daisy chained for up to 6 Thunderbolt peripherals. mLink can house a single full or half-length PCIe card with special drivers that are Thunderbolt aware. The company offers a list of supported partners and users will want to ensure their specific card is supported. There are a range of storage and network devices supported.
The box supports PCIe 2.0 x16 cards with running at x4 mode.