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DefaultDepth just forces the color depth to 24bit. Just leave it there. As for Xv, try playing some videos with that extension; if the video player crashes or complains about an invalid extension/overlay, then try setting the VideoOverlay/TexturedVideo options I mentioned.
If you do force those options, which one to use will depend on what card you have; according to Bridgman, cards older than the x1xxx series had a better overlay engine than the newer cards, which in turn had much better shader processing. TexturedVideo just forces the card to render Xv using the 3d engine (shaders), therefore it being preferred with cards that have powerfull shader capabilities. You could still use TexturedVideo on, say, a 9800PRO, but chances are that it would be slower than using regular VideoOverlay. This of course, matters little if you have a powerful card, but when using a lowly IGP, every little bit of speed gains matter.
Edit: Here is how my xorg.conf looks (I use aticonfig):
I *think* the issue is that Hardy came out at a point of rapid change in the X framework. The X server version seems to be an awkward one which works OK with the drivers that shipped with Hardy but doesn't work well with many older or newer drivers.
Take all this with a grain of salt, it's just the impression I have picked up over the last couple of days.
So it stopped working after 3 days? What exactly did you do when that happened? Reboot? I would uninstall the driver you have now, reconfigure X, and install the driver again, but this time do it "manually" (get the installer from ATI's website and run it).