The comet has grown quite large in the sky - this image is 7 degrees across! I used a different color balance routine with my DSLR and I'm seeing a different color for the comet than a month ago. I can't say if the comet color is really different or not!

Acquisition Details:
Date: 12/11/2007
Exposure: 11x120 seconds
Telescope: Canon 200mm f/2.8 lens - stopped down to f/4
Mount: Sirius EQ-G
Camera: Rebel Xt