Actually, one of the biggest demands for H1-B's is in the healthcare field. Most major medical facilities as well as many of the rural hospitals now depend on the H1-B Registered Nurse from India or the Philipines to fill unfilled openings. Additionally, most of the rural areas now depend on the H1-B physician to meet the medical needs of the community. To assume all H1-B's go to the IT industry is a misnomer.
My sister is an RN in San Diego. After 25 years in that line of work, she laments that 90% of her time is spent filling out paperwork to provide legal protection to the hospital. Very little "nursing" or patient contact is involved in her daily work. The U.S. trained nurses have become discouraged with this turn in the nature of their work. Malpractice insurance also digs into the income of a nurse. Hospital budgets are strained by legally enforced requirements to provide care to illegal aliens. The combination of disinterest in the screwed up state of medicine and the economic pressure on the hospital makes hiring foreign workers on the cheap an attractive alternative.