Two of the devices are targeted for the European market, one is targeted for the US market.  The following is quoted from Avid's press release that announced the products:

"The new ultra-portable Pinnacle TV for Mac Sticks turn any Mac into a full-featured TV receiver/recorder with remote control. "Macs are famous for their eye-catching design and the cool features within the OS. Now Mac users can use Pinnacle products to further extend the capabilities of their computers and transform them into personal TVs and video recorders," said, Pinnacle Systems general manager and Avid vice president Jeff Hastings. "With Pinnacle TV for Mac Sticks, anyone can enjoy an easy-to-use, high quality TV experience on a Mac, whether at home or traveling."

The tuners ship with Elgato's EyeTV Lite TV viewing and recording software.  Mac users can now watch and record TV programs directly on their Macs.  Recording can be saved in DVD-qualtiy MPEG-2 format.  Pinnacle also packages an A/V adapter that makes it easy to import video from an external source directly to a Mac.  The TV Tuners will be available in the US starting in March 2007.

You can view Pinnacle's Press Release here.

Switch To A Mac Commentary
Traditionally a PC peripheral manufacturer, Pinnacle's release of Mac-based TV Tuner cards is a clear sign that companies must either accept the growing popularity of the Mac or be left behind.  It's only a matter of time before additional peripheral and third-party hardware vendors jump on board and begin to release Mac capable devices.