This is a nice bright Kreutz comet that passed through the STEREO spacecraft's H1A camera's field of view on the 2nd of January (click to embiggen). You can see that the tail is not quite straight, and in the animation below you can see it twist over 24 hours of its passage. Comet Al has a much better animation here.
There has been a veritable stream of Kreutz comets passing the H1 imager in January. A nice one is visible in pictures from the 14th at the moment. I may try and animate it tomorrow if I have time after the blogging panel at RiAus.