Greg - 15 megapixels combined with that noise performance, the upgrade from 20D to 50D would have a tremendous impact on 13x19 prints. The larger the print of course, the more important the difference. 4x6 will have virtually no benefit on its own, however you could squeeze in much tighter crops.

Loupey - thanks for the sample shots! Canon never fails to amaze me with their engineering for noise performance. What process have they squeezed into their CMOS this time to reduce noise so significantly?

Also - on the first shot of the girl standing in the bleachers - did it crush the tones of her black pants? Or was the detail retained? And lets see your reflection in the tuba!