Do you find the fast forward / rewind (scan rate) of Apple DVD Player too slow? Open the com.apple.DVDPlayer.plist file within ~/Library -> Preferences in TextEdit and change the 4 in the sentence:
<key>DefaultScanRate</key><integer>4</integer>
to 8 or 16. I haven't tried it maximum, but 8 and 16 seem to work fine.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20031102145804351