Images in Finder/Coverflow SERIOUSLY pixelated

Has anyone had issues with coverflow in Finder seriously pixelating images?
I'm having it in random folders (but not all) and I cannot find any rhyme or reason for it.
Is Leopard generating previews and just not done yet maybe?
Here's an example of what I'm seeing:
http://www.allenrockwellphoto.com/images/pixelated.jpg
As I said, some folders show images sharp and clear, others show them this way ... there seems to be no logic to it.

I have the same problem with images on the internal disk, although they were copied there from a external after my erase and install. Raw files look fine and so do smaller jpegs. I also see the issue with psd files but not pngs.
I think this has to do with the new higher resolution leopard icons. This is what I think is happening.
Those jpegs were saved on a tiger system. When the file was written there was a icon thumbnail generated at a 128x128 pixels. This was the largest size supported by OS X up until leopard. New leopard icons can be up to 512x512 pixes, W00t!
So as a result your icon preview stored with the file is 128x128 but is being scaled to whatever size your cover flow window is sized to. Hence, causing pixelization (sp?).
To test this I opened one of the problem images in preview, did a "save as" to a new file and voila! beautiful coverflow icons. However, my photoshop CS3 is still unaware that it should be writing higher rez thumbnails. Perhaps I should run adobe updater...
I'm looking for a command line or apple script way to update these thumbnails without changing the modified or created dates so the process can be scripted.
Ideally you should point the script to a directory, find all image files with less than 512x512 icons, regenerate the thumbnail and preserve any modified or created dates.
The sips command line tool doesn't seem to do the trick. Any ideas?

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