Imaged by many astronomers, Comet Lulin may have been one of the most popular non-regular comets I've seen recently. There were so many great images I couldn't possibly include them all, so I've posted the best for your viewing below. Overall, I think Comet Lulin was a great way to kick off the International Year of Astronomy. If you didn't get to see the Comet, just check out these beautiful pictures of the popular green comet! If your image isn't on the list, and you'd like to see it here, just submit your image to me at firstname.lastname@example.org or post a comment below!
There are also excellent conversations on Comet Lulin at Cloudy Nights and SLOOH.