I came across this article on my search the other day, and thought it was a very well-rounded read:
Diagnosis and Management of Pre-eclampsia
It seems to cover everything - from gestational high blood pressure to severe pre-eclampsia, and all the things in between. It talks about different types of treatment, depending on severity. Of course, severe pre-eclampsia ultimately leads to delivery of the baby, the only real known treatment.
There is also Pre-eclampsia.org, which has Information and Forums. In the Forums, there is a section called Ask the Experts, which are questioned answered by medical doctors. Ask the Experienced has moms that have experienced pre-eclampsia firsthand, and have become self-taught experts on the subject. Their knowledge is very in-depth.