Mardi,
I believe my issue with video tearing sounds _very_ similar to yours and like 
you suspect everyone else's is the same. I believe the problem is when 
compositing is enabled (and I think even when effects are disabled in compiz 
compositing is still enabled). To confirm try the following:

Switch to a different window manager that is not compositing enabled (such as 
MetaCity or KWin(for KDE3, or KDE 4 with desktop effects disabled as that does 
disable compositing).
Switch to xinerama for dual monitor support, again compositing should be 
disabled and you should find no video tearing.

Also for me I find that tearing only happens on one monitor, I have one at 
1680x1050 (59.9hz) and another at 1280x1024 (60hz) and get tearing on the 
larger of the 2 but not the smaller (however if I disable dual monitor I don't 
get it on either of the monitors, which ever is enabled).
Also I don't just get the tearing with video, its more noticeable with video, 
but on the monitor with tearing if I shake a window around a lot for a long 
time with wobbly windows (and sometimes even without) you can see the tearing 
there too.

Finally I think it is compositing not compiz since I am using KWin-kde4
and get the tearing.

-- 
compiz+nvidia: tearing in xvideo (totem/mplayer/VLC/XINE)
https://bugs.launchpad.net/bugs/151674
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