Re: RN jobs in Boston area
Things are very tight here in the city, but where you have a year of experience, you may have better luck than some of the new grads (like myself) are having..
I went to a job fair in the Longwood Medical Area today, and was advised by a recruiter to be persistent. Keep calling/e-mailing to follow up, and keep applying to postings, because if a recruiter continuously sees/hears your name, they may be more likely to contact you.
I worked at one of the major hospitals you mentioned, and even as an internal transfer applicant (Nurse Tech --> RN) I'm having a tough time getting a job there. Everyone wants to work in the big name hospitals.
Where are you living? Have you tried community hospitals, such as the Caritas Christi system (they have locations in Boston), or places just outside of town?

While it may be your dream to work in a major Boston hospital, it's very tough as of right now to get their attention---there is a MAJOR glut in the Boston area.
Google "MA Hospitals", and you will find a list of all of the hospitals in the state.
Hope I was some help. Keep trying.