So today I went back determined to try again and found that they had redesigned the entire site. It loads much faster, and presents the art to you in a much smoother interface. You can see many more thumbnails per page, and change the size of the thumnails depending on how many you want to see. Once you click on a picture, you can then easily scroll through from one to another very quickly, without having to wait for the entire page to reload again and again. Also, they managed to provide a nice fade effect, so that the transition between pictures is smooth. The only downside is that you can no longer link to a single piece of art.
Oh -- and also, you can no longer just click and download each picture to your own computer. I'm sure there must be a way (short of taking a screenshot), but it's beyond me. I'll take it as a sign from heaven, since I can no longer conveniently build my "Best of" folder, that the "Best of Blizzard Fan Art" site is the whole Blizzard fan art site itself. Now, with the tediousness of complicated page-loading removed, you may find browsing through the artwork gives you a whole new experience.