I have the Archos 605 and have moved movies from my 622 to my Archos with no problems. Just have to go to Archos website and download the plug in and then you are good to go.
The plug-in download says "Only compatible with the ARCHOS 405, 605 wifi and 705 wifi". I see no reason why it couldn't work with the TV+ (or for that matter with gen 4 PMPs), but thus far Archos does not support it. They may not even give you the plug-in, if you insert the SN from your TV+.
Thanks for input. I am thinking of getting one. It does allow you to download from CinemaNow directly to its box for viewing on your TV as well as any content on a PC.