Check out the siskind or shusterman sites for their newsletters. Unless Congress decides to allow unused visas to be used for these categories, nurses from India, China, and the Philippines won't be able to apply for green cards (and, apparently, this will affect nurses from other countries as well) as of January. If you have a 4-year college degree, you can probably look for H1-B sponsorship (Physical Therapists also have this option).