The page earmarked here takes you to a discussion of general symptoms and then into an explanation of BP I, BP II, BP III and Cyclothymia. Another offbeat, fun bipolar site. Dr. Ron Pies answers the layperson's questions about various mental disorders and the drugs used to treat them. I've included links to questions pertaining to bipolar disorder only below, but please check out this question index link for tons of questions and answers on every illness imaginable. You must first register with Medscape before you can access the database.
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This is a superior list of abstracts for journal articles detailing recent research into the treatment of Bipolar Disorder. Articles aren't online, but should be available at most university libraries for free. On a new server, Pharmweb is a cornucopia of good information. You'll find medical dictionaries, search Medline, newsgroups and too much more to mention.