You might want to add rur-ple (http://code.google.com/p/rur-ple); it is similar to Guido van Robot (and was inspired by it). However, 1) it uses Python (instead of a more limited, Python-like inspired language); 2) it has more lessons and exercises than Guido van Robot; 3) it provides an embedded programming environment to go beyond the robot's world.
I appreciate you putting this together and was about to send the link around when I ran into Application errors throughout. Looks like your server kicked it.
Yes, I see lots of 503s in my Heroku logs :-( This is a pet project, so I don't wanna pay for it, which means you all probably have to live with this until the initial wave of traffic dies down again, sorry!
Oops sorry. I saw you had promo'ed your site in the comments of an earlier article about kids and programming that HN linked to. So, I just wanted to spread the word :)
See my comment above - the image is using fixed-positioning and has a default z-index above that of the links. They can fix it by setting the image's z-index to -1.
