I really like 1st Dibs. I don't visit it every day, or even every week, but when I do it sucks me in and when I'm done I've spent more time than I had planned.
1st Dibs is a huge on-line marketplace for antiques and mid-century modern furniture and accessories--Portobello Road or the Paris Flea Market on steroids. 1st Dibs also has a beautifully designed and edited section on people, places and ideas. There are great garden elements to be found--bought or used as inspiration.
The profiles in Style Compass or books in Required Reading get me every time.