They already announced several months ago that al Qaeda had abandoned a plan to attack the Brooklyn Bridge, because of the security procedures in place. They picked that up from 'chatter'.
My biggest fear is an attack on the UN, in an effort to further fracture the US's relations with other countries, as they have been doing in Iraq & Turkey. (i.e. attacking non-Americans who are there working, such as the Spanish & the Italians.) The UN is just one and a half miles north of me as a pigeon flies. I'm assumed that it is being guarded up the wazoo, but since it is right next to a river, that probably complicates security measures. I'm glad that the police commissioner now is Ray Kelly, who really has his act together.The mayor on the other hand makes me a little nervous.
While a very smart man who built a huge company from the ground up,
he is about as bland as a person can be, and doesn't connect to people well. Pre 9-11, a lot of people didn't like Mayor Giuliani, but no one had any doubt that he would step up to the plate with a passion under any circumstances, even if they didn't agree with his viewpoint on a particular issue.
The New Year's thing in Times Square would probably require chemical/biological agents to mount an attack. It's too contained among large buildings for something like an airplane strike.
I hope my fellow Americans don't take too much umbrage with me for saying this, but if they are actually going after some target, I kinda hope it is on the west coast this time. I've heard from a number of people that numerous Californians in particular think that NYC should have 'gotten past 9-11 by now', and that 'we're just milking the situation'. My brother was in California over the summer visiting his son, and got into a conversation with a elderly retiree who made a similar comment to him, even after hearing that my brother was a retired NYPD officer. If al Qaeda took out the Golden Gate Bridge, or UC Berkeley, I have a feeling they would all be singing a different tune. While I fortunately did not lose anyone that I knew on 9-11, there isn't a day that goes by that I don't think about it.