Is there anywhere I can download high ISO RAWs from the LX3, GX200 and G10?
There is this site
for sharing dSLR raw samples and you'll find the occasional dpreview.com forum user posting raw samples for compacts. The problem with both is competence. You don't need just any high ISO raw file, you need one that's properly exposed and one in which the lighting conditions are appropriate to high ISO shooting, etc., etc.
OTOH: I find a page like this one
by LL poster Wayne Fox for the G10 is so well done that I don't feel the need to repeat the test myself. I can see instantly how the G10 compares to my dSLR, can see that good noise reduction would leave the 400 ISO reasonably usable and at 800 it would depend on how much detail I needed for the subject matter I was working with. Having seen Wayne's page and having read Michael R's report that the LX3 has essentially the same high ISO noise characteristics as the G10, I'm comfortable that I have a handle on both camera's ISOs.
What would be ideal would be if Wayne could explain exactly some standardized procedure for taking usable test shots like his for ISO/noise, DR, and res. This would need to include some readily available, standard test material, like Bjørn Rørslett's good ol' brick wall for resolution. Then when an LL forum member acquires a hot new camera, he could take the appropriate raw shots and post them to raw.photosite.pl. This is really the job that review factories like dpreview should be doing, but regrettably they all seem to have been permanently hypnotized by the JPEG format.