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Gaussian, if you open the file in photoshop and check out the blue channel, you'll see what appears to be jpeg artifacts (or I've always attributed them to that).

You see that EXACT pattern in most consumer level digital cameras... heck, even in a lot of pro cameras. It's the blue CCD not receiving enough light data and getting to contrasty. Then with jpeg building it's algorithm based on image contrasts, it gets more distorted.

At least, that's how I understand it. Regardless, the solution is roughly the same as for pure jpeging, you simply do it to the individual channels.

OH... something I forgot in my run down. I tried to use unsharp and it just kept bringing back the noise... so I used a highpass/overlay instead and it seemed to work much better. I just masked out the hair and some of the face because it started to get noisey again.

I hate dealing with that stuff... digital noise is a pain because it's a lack of data in the photo, just as bad as if you'd underexposed or something. Sometimes it's worse because it's not a global problem... it's a bunch of little problems  Good luck.

<edit> We're just playing thread-tag now aren't we.   </edit>