A little off-topic but...
I found that XBOX Media Center will play a DVD and (conveniently) leave out the MacroVision signal.
Nice for archiving your original DVDs with a DVD recorder and give the kids a copy to play with or keep the copy in the car. Of course, full resoulution, menus, 5.1 audio, original quality and other extras are lost but that's probably acceptable for most applications (little 7" portable/car players). Also, XBMC does not support DVD menus. It still looks better than a SVHS original.
There are also in-line devices that remove the MV signal but they are not 100% clean and cost ~$100.
BTW: My SA1/3.0 Tivo will also record with MV signal present but the recording is extractable to DVD with tytools.
perl -e 'print unpack("u","\@2\&\%V92\!Y;W4\@:&\%C:V5D(\%E/55\(\@5\&EV\;R\!T;V1A>3\\-\`"),"\n";'