This is one of the most spectacular comets to visit us (and waiting for comet ISON at the end of this year).
Now, it is easily seen over the western horizon, soon after sunset.
I took these pictures from Falset’s castle, on March 15th, at around 19:50 local time (18:50 UT). I used an Olympus E450, with a 150mm zoom, at ISO 400, and exposures ranging from 4 up to 6 seconds. And no processing (only some cropping).