From the site:
"The Italian Electronic Classroom! is a project of Centro Studi Italiani, aimed at providing free on-line, useful information on difficult aspects of the Italian language to students, teachers, translators, writers. This is a work in progress. Periodically we will add new pages on topics covering grammar, vocabulary, pronunciation and so on. Visit our site again and send us your suggestions!"
This is an absolutely rich resources for advanced beginners to the functionally fluent!
The entire "online classroom" is written in Italian, and covers things as simple as the colors and as complex as metaphors that use animal names.
You have to check it out to really see the depth of the resources here.