Some of my favorite sources of information on prematurity are as follows:
A Child in Time: New Frontiers in Treating Premature Babies
Peek-a-boo ICU has a good article regarding the statistics of premature births and also mentions Veronica's Journey here.
Graham's Foundation is an organization specifically focused on supporting parents of extremely premature babies/micro preemies. When Veronica was in the NICU, they sent us a care package which included preemie info, a disposable camera, a blanket, hand sanitizer and lotion. Veronica's Journey is also mentioned on their website.
My favorite sources of information on preemie issues are the other parents I have "met" via Facebook and a micro preemie Yahoo group.. If you notice on the right hand side of my blog, some of their blogs are listed. Each one contains a wealth of information.