I recently used Facebook to solicit advice from my friends on where I might buy some new art prints for my home. One friend (thanks, THP) suggested art.com, and I did find a lot of great prints there to choose from.
But the best thing about art.com is that you can learn a lot about art there. They have their prints categorized by era (pre 12th Century to 20th Century), by movement (Cubism, Art Nouveau, Impressionism, etc.), by nationality, and by subject (animals, scenic, dance, etc.). And, because within each category there are dozens and dozens of famous works, you can scan through them and get a feel for that movement or century or whatever you're interested in. Yes, you're just seeing a tiny image which could never capture the subtleties of the actual work of art, and this is no substitute for going to museums and seeing the masterpieces for yourself, or even for taking a course or reading a good art history book. But this is the best overview of the world of painting that I've ever experienced.
I skimmed through a few dozen paintings in each movement from the 17th century to the present day. I now know why Vermeer is considered such a genius, after seeing his work next to many others from his time. I saw the difference between Impressionism (nice) and Post-Impressionism (horrifying). I confirmed my suspicion that, although I can appreciate the skills of the Hudson River School, landscapes bore me to tears. Not surprisingly, most of the modern movements are a total fraud and just plain ugly. But now I know a bit more about them. And I found a few new artists that I love - hurray!
I learned more in 3 hours on art.com than I've learned in any one place before. However, if I had no knowledge at all going in, I don't think I could have learned very much. I already had some ideas of what I liked and what many of the actual pieces looked like. Art.com just helped me with categorization and filling in a lot of gaps. (The multiple ways to filter makes shopping for prints an amazing experience as well.) If you're like me and enjoy art, but are a relative novice, it might be worth a few hours of your time. Let me know if you enjoy it!