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This is Comet Lulin which is currently passing close to the Earth as it makes a lap around the Sun. I was down at the Ranch last weekend and Lulin was bright enough to see naked eye, including a faint tail. While not as spectacular as 2007's Comet Holmes or 1997's Hale-Bopp (that one was incredible), Lulin was fun to find and is the first comet I have tried to image.
I took several images, using various exposures and techniques, but this image sequence blew me away! I took 8 x 10 min exposures while guiding on the comet head (so the FSQ telescope tracked the comet's movement, thus the streaking stars). Once I saw the sequence animated I flipped -- you can easily see great plumes of material ejecting from the head of the comet, opposite the tail. Man, I wish you could see my hi-res version : )
More Lulin images on the way. In the meantime, go catch it if you can. It is at its brightest point right now and the moon is dark.
UPDATE:
Here is a link to a B&W crop that I believe gives a better view of the ejecta...
http://www.astroclassifieds.com/gallery/data/526/LulinBW.gif