This is a phenomenal and extensive resource. It details personal stories, causes and technical information, as well as how long to wait before trying again. Unique in that it is written from a personal perspective.
A list of frequently asked questions developed from a pregnancy loss newsgroup. It touches on everything - coping with grief, fear in subsequent pregnancies and coping as a couple.
While it has taken some heat for representing anger and negativity, this page shares some thought provoking responses to those insensitive, and often cruel comments.
A Reproductive Endocrinologist outlines the common locations for an ectopic pregnancy and the current courses of treatment. Of special interest: the treatments relied upon during the 11th century. Further links are available, discussing risk factors, diagnosis and treatment options.