Compact Flash CF to 2.5" SATA Spanning/ Mirroring Enclosure
By Sans Digital

Unlike existing RAID units that employs hard drives for storage space, the CompactSTOR CR2T utilizes pocket-sized lightweight Compact Flash cards as storage memory for data safekeeping. The CR2T supports spanning and RAID 1 (mirroring) by housing up to two Compact Flash cards. Designed with the same size and connectors as a 2.5 SATA hard drive, the CR2T is compatible with the hard drive slot of laptops, industrial PCs (IPC), small form factor computers, and 2.5 hard drive enclosures. ... 

Compact Flash CF to 2.5" SATA Enclosure
By Sans Digital

Unlike existing RAID units that employs hard drives for storage space, the CompactSTOR CS1T utilizes pocket-sized lightweight Compact Flash cards as storage memory for data safekeeping. Designed with the same size and connectors as a 2.5 SATA hard drive, the CS1T is compatible with the hard drive slot of laptops, industrial PCs (IPC), small form factor computers, and 2.5 hard drive enclosures. ... 

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Pro Dual Compact Flash Adapter 886X Expresscard 34 OSX Req 10.5+
By Sonnet Technologies

Sonnet's Pro Dual CompactFlash Adapter ExpressCard/34 enables you to transfer files concurrently from two CF memory cards to your MacBook Pro on-location or in the field, studio, or office. Pro Dual CompactFlash Adapter ExpressCard/34 supports the fastest available CF memory cards and future CF cards up to 886x at full speed, making it a superior alternative to USB memory card readers. ...