HomeFurnish.com has decorating & home improvement information sorted by room.
InteriorDesign.net is the online home of high-end Interior Design magazine.
About.com’s interior decorating portal has articles on a range of topics including decorating inspiration and holiday décor.
iVillage has tons of great interior decorating articles as well as info on related topics including entertaining and gardening.
Behr Paints has a great site about using color inside your home and is a great source for inspiration.