Here are some useful links I'm collecting on the subject:
Dollhouse Electrical -- a wonderful article from the Greenleaf site which covers just about everything one needs to know about wiring a dolls house. There are other great articles on lighting in this issue, too. Highly recommended.
Dolls House Parade -- Hints and Tips on Lighting -- another great article. Lots of other tips at this site, too.
This blog chronicles the adventures of a group of Canadians building a 1:12 scale medieval or Tudor dolls' house or dolls' castle. We're also working on a William and Mary era dollhouse circa 1700, featuring Jacobean, Carolean and Queen Anne furniture. Dollhouse aficionados, those who enjoy making or sharing doll house miniatures, and people who enjoy sharing crafts with children may enjoy the adventures of this group.
I built the background image of this site using some of the fabulous work from Vintage Retro Grunge. The "Green Man" reproduction medieval tile on the bottom right is by Kate Tiler. The other two, the griffon and the happy little creature (possibly a lion with a bagel?), are both by Pataki Tiles.