I have one of these, the Pinnacle nano 73e.
I have almost got it working in Linux, I had to download the firmware, but the driver specified what firmware I needed in the results of "dmesg" and finding it on google was no problem.
The only problems I have on Windows and Linux are software ones, on linux they mainly relate to odd settings being used for the encoding in NZ, anything based on xine (like Kaffeine) gets video, but the sound dies out after a few seconds due to being unable to decode the audio properly.
The hardware is nice, seems that the problem is that the software that comes with it sucks, and weird settings are used in New Zealand that some software cannot cope with, yet.
Edit: No luck, MediaPortal won't pick up any channels.