I use the Pretec USB 3.0 card reader on my PC and wish they come out with a Thunderbolt card reader for my Core i7 13.3" MacBook Air. The Air has a SDHC/SDXC card reader slot built-in that reads @30mb/sec but with the new 95mb/sec cards a Thunderbolt reader would be better. I have FW800 on my MacMini but use a USB 2.0 reader with it.
The only one I have been able to find (lexar discontinued theirs) is the red reader. Kinda pricy but also has usb and esata. I just picked one up although I haven't used it yet.