I have SDP-H200 and successfully using it with Mac-mini G4.
May be info on Panasonic site is outdated, but my camera came with ImageMixer for Mac. It is not very user-friendly software, but with 3 step process I am able to move my video from camera to Mac.
-- Using ImageMixer to export clips into computer as *.mpg files
-- using VLC to transform it into MPEG-4 (or MP4) format
-- import into iMovie or Final Cut.
It is multistep and slow process, but it works. I wish to update to Leopard with iMovie 08 and hope it will support my camera better.
I have only JUST bought the Panasonic SDR-H20 ... after having depressing failure with the technically superior Sony DVC 290 HD camcorder on iMovie .. it simply does not see the 'muxed' MPEG2 nonstandard files so I used Visual Hub.. it worked but the results were a bit disappointing and long winded to say the least. Ahem.
So I took some H20 test footage....plugged the USB cable into the Mac and voila .. up comes iMovie Import page and all the thumbnailed files from the Panasonic went straight in there. Nae worries.
I am currently as I type creating a long winded movie using various past converted footage.. a selection of converted Sony files, AVI and MPEG4 stuff ... compiling a fiddly DVD which has taken 5 hours to convert and now another 3 hours to encode on iDVD .. but first impressions show that the Panasonics ARE Mac friendly.
Its whether or not the quality is there with PC editing on something like Pinnacle Studio which was excellent or whether iMovie automatically lowers the resolution of raw footage from stage one as a trade off for its 'ease of use' to Joe Public.
In answer to your question then ... YES the Panasonic HDD SDR-H20 IS Mac happy ... just dont expect any dedicated OSX software .... hope thats of some help!
I've had so much trouble with the Image Mixer programme... I can't even save the video files onto the desk - they just don't open. I also bought Quicktime Pro, and can't open the Image Mixer files from there... Maybe my programme is faulty?