Thanks to @Elchie I learned about Try Ruby! - a web based Ruby interpreter. An Applet based web version of a language isn't all that new. But, what's done quite well is the tutorial.
The interpreter and tutorial are linked together, so as you try out the examples, the next step in the tutorial is shown. No more scanning past the examples - it only works if you try them out.
Even if you aren't interested in learning Ruby this is still a user an impressive user experience and one worth checking out.
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