You can create, and use, flashcards very quickly and easily, and grab images and videos off the Web to insert them in the virtual cards.
It’s a German site that has just added the ability to have its site in English, and it appears they haven’t worked out all the kinks yet in that transition. So, one negative is that after you register on the English page (registration, by the way, is quite easy), you are brought to a page in German. Then, you have to go to the bottom of the page and figure out what the word in German is for Language, and then switch it to English. (The bug has been fixed — that was quick!)
I suspect they’ll fix this problem pretty quickly, though.