Adding Perl and Unix related material to the French Wikipedia site, I discovered a wikepedia in esperanto.
I found that reading technical material was the best way to learn English because of the abondance of known vocabulary. And that was despite the bad quality of Sun documentation at this time which was vanilla BSD (with the joke about tuna fish). I suspect reading technical material in the esperanto wikipedia is the best way to learn esperanto. Clearly lacking is an entry about Perl! The entry about Unix: http://eo.wikipedia.org/wiki/Unikso -- stef