I would definitely encourage you to apply, especially if you aren't hearing from anyone at the moment. As a job hunting new grad I understand how the job market is like in NYC. Take what you can in this economy. Plus ER experience is great. You can branch off into so many other fields later on if you want ie L&D, Med/Surg, Neuro, Resp... I mean you'll be exposed to so much. And once you get your foot in the door, you're in, you can always transfer to another unit.
I can understand your hesitation though. It's an ER. We're new at this field. Patient turnover is high, you have to asses quickly but thoroughly, watch for signs of decline and decompensation, manage your area, take notes, transfer patients, admit patients, give meds, and et cetera all in a very high energy, quickly paced environment. But this is real nursing. While in my senior year of nursing school, I knew one of the students from the year before who'd landed an ER position. She told me it was stressful (which is the common complaint of many if not all new grads) and a lot of work but at the same time, she was learning a whole lot. I see it as an amazing opportunity. Imagine what your assessment skills, your patient and time management etc will be like in a few years time. If they hire you (let's say when to be more positive), they'll know that you're a new grad. You'll have orientation, you'll be precepted, you already know a nurse there and you'll have the nursing support staff.
So, just think about it, but not for too long, there are so many schools churning out new grads like us, not to mention the huge population of nurses out of a job or returning to work because of the economy. Job hunting is networking as well as applying. If you have an opportunity presented by a friend, take it.
Good luck :)