My second favorite series of books, Outlander by Diana Gabaldon, has several great sites that I'll list here:
The Diana Gabaldon Home Page and
The Ladies of Lallybroch
I have subscribed to numerous mailing lists due to my diagnosis with PCOS and also with my new low carb lifestyle. Go to OneList and search for any topic that might interest you. I pretty much guarantee you'll find a list for it!