Blogs I follow
Website Communities/Messageboards I belong to:
The Historical Writers Association Forum (open to guests!)
The Crimean War Research Society
Yahoo Groups - Renwars
The Word Cloud
WriteWords
Visit Living History Worldwide
For up-to-date information on EastEnders I'd really recommend the Walford Web. There are a number of soap sites out there, but this one is remarkably well-informed and the members are clearly passionate about the show.
Historical websites
There's a whole list of 17th century historical online resources on the Honour and the Sword website
Swords and Renaissance martial arts
Cut and Thrust Schoole of Defence
The Dawn Duellists
The Duellist
Sword Forum International
Historical fiction and historical writers
Conn Iggulden
Bernard Cornwell
Lovereading Historical Novels
Bookhugger Historical Fiction