The first two types are self explanatory, but the temp to hire positions are defined as those in which you go to work for the company, get paid on a temporary basis, and may or may not get converted to a permanent company employee. After giving the agency some of your criteria, and faxing over to them your resume, salary requirements, travel distance capabilities and other items, you will probably be asked to interview with the agency. This is so that they can get a sense of your personality and interviewing skills. Treat this as you would any other interview and go in professionally. The impression you make will be what they pass on to the employers who are looking for applicants.
Temporary positions are great ways to break into a new field.
Being open to these possibilities will probably find you a position more quickly. However, the drawback is that the position may be terminated at any time or be only for a set length of time. Ask these questions of the agency up front as well as the likelihood of the temporary position going permanent. They generally can get a good feel from the employer. Using headhunting agencies to broaden your career search is an efficient way to have more than one pair of eyes out their searching the job openings for you.