I made a few ISO 640o test shots tonight with my new 7D. I am quite pleasantly surprised by the results. The 7D seemed to manage noise control quite well at ISO 6400 while managing to retain image detail quite well. All the pics were shot in RAW and converted with DPP to TIFF files. The TIFF were then converted to JPEG with Photoshop. No further post-processing was done, no additional sharpening was added. You can click on the individual images for a full resolution view.