During my most recent twanderings on Twitter, I came across this fascinating online resource made by Faiza Khan in the States - called WordAhead.
It's a beautiful site with wonderful vocabulary cartoons for learners. Admittedly the word list varies from high intermediate to extremely advanced (quite a few words there I hadn't used for some time or couldn't actually recall!) - but more importantly, I love the concept.
Faiza also lets you install widgets featuring her videos and card games on your site or blog, so thanks Faiza - I shall!
Now, I wouldn't necessarily recommend this to my usual audience of teachers of children and teenagers (unless you have some exam prep going on for later teens), but I've posted it here because I love the concept!
Faiza, if you can make a version of this for younger learners with more basic vocabulary items, you'll be on a real winner - I assure you!