Lunapark6 posted a review on the Elgato Turbo.264 stick for the Macintosh
A quote from the article:
Elgato Turbo.264 Review
Elgato Systems, the maker of the very impressive EyeTV, has released another cool nifty device for the Mac platform. The Turbo.264 is a thumb size USB stick video encoder that accelerates encodings for the iPod, iPhone, AppleTV, or PSP formats. Turbo.264 also comes bundled with its own elegant software to manage those encodings. The unit is especially well suited for Mac Mini, MacBook and iMac owners that encodes video often but would like to free up resources for other tasks. Not bad for a suggested retail price of $99.
Elgato Turbo.264 Review