I'm in at GULC and UF for the tax LLM, but still waiting to hear from NYU. I want to make a decision soon-does anybody think it's worth it to call/email NYU and ask tell them about my other acceptances and see when they will make a decision on my app? Is this just going to piss them off?

I don't think you will piss them off, but I don't know that you will make much progress in coaxing a decision out of them. First, I don't think you'll speak with anyone who is on the admissions committee... more likely you'll get someone who will pull up your file and read the "status" line to you. Second, I don't think NYU is easily swayed/persuaded into making or releasing decisions. They've pretty much established that they are going to do things on their own schedule.

I don't think it will hurt and I would likely encourage you to do it if there is any chance it makes your decisions easier... but good luck :)

Hi...I just emailed them to ask for result, and they replied me like this:
Thank you for your interest in NYU School of Law.
As indicated in our application materials and on our website, LL.M. applicants who meet the December 1st deadline will be notified of the Committee on Graduate Admissions decision in early to mid-March. The decisions for the NYU@NUS program will be communicated on a rolling basis through January. Unfortunately, there is no way to predict an exact date on which an applicant will receive a decision. We appreciate your patience in this matter.
The Committee on Graduate Admissions recognizes that law schools operate on different calendars, and sometimes applicants must decide on whether to commit to another institution before hearing from NYU School of Law; we regret any inconvenience this may cause you.

For your reference...

I am in the exact same position in waiting for NYU to reply. I have not made any progress in deciding between Georgetown and Florida. Hopefully, NYU will make the decision easy and if not easy soon.

I don't think it works in that way. 'cause in the past few months I tried every means you are thinking of, writing emails (even with harsh words), making phone calls... the only purpose is to push them to make the decision ASAP. However,each time they came back with the boilerplate for me. What can I say? Nothing will change their mind for they look well immune to various complaints.
They said they will release all the decision by this month. There is a one week break in Mid-March. Just hope they will clean up everything before that.

What you can do, but only if you have another offer outstanding, is to let them know you're considering between their offer and the one from NYU (or any other institution you are contacting). They (and by they I mean any institution) usually expedites such decisions, though the downside is that if you were on the edge, that might drop you into the "rejected" as opposed to "admitted" basket (though of course, it could also come out the opposite way).