I'm surprised that I haven't seen any reports about observing comet C/2011 L4 (PANSTARRS) on this board. I've now spotted it on five different evenings starting a week ago. They were:
March 09, Saturday, East Point, NJ
March 12, Tuesday, East Point, NJ
March 13, Wednesday, Philadelphia, PA
March 14, Thursday, Delran, NJ
March 15, Friday, Cherry Hill, NJ
In all cases, Comet Pan-STARRS was found and observed with binoculars, and on the 14th, I also got a look with my 80 mm apo refractor. Oddly, the best view so far was on the 13th with 10x42 binoculars from Winter Street, next to the Franklin Institute in center-city Philadelphia, when the comet was about 10 degrees directly below the crescent moon (the transparency was excellent in that direction at the time; on the other nights except the 14th, it was cloudy/murky along the horizon). I have yet to see it with my unaided eyes.
On the 12th, I captured this image of the comet next to the 28-hour-old crescent moon from East Point, overlooking the Delaware Bay, at 7:54 pm EDT:Click here
for a larger version.
It can be difficult to find in the evening twilight (solar elongation is still less then 20 degrees) and it's not exactly brilliant against the relatively bright background, but it does have a classic comet shape with a well-condensed head and a short, but distinct tail. Those expecting a "Great" comet might be disappointed, but compared to most of the comets I see, this one is pretty good (bear in mind that I thought comet 168P/Hergenrother was exciting when it had an outburst to magnitude 9 last fall).
It's certainly worth taking a look when the weather permits.