Not to forget that there are all sorts of answers to art questions right here on About.com. The easiest way to find something is to use the search box top right, but here are a few examples:
My Painting Problem Solver has answers to general art questions as well as medium specific. It includes What are the Elements of Composition? and What are the Elements of Art?
Charcoal Drawing FAQ and Pencil Drawing FAQ from About.com Drawing & Sketching
How to Curate Art Show and Other Curator FAQs from About.com Fine Art
Why Should I Study Art History? from About.com Art History
What did Leonardo da Vinci's Anatomy Drawings Look Like? from About.com Arte (even if you don't read Spanish, the photos are interesting! Ir read it using an automated online translator such as Google Translate.)
What Does a Curator Do? from About.com Fotografia