Here are a few more “English learning” online resources that you might find useful:

English grammar

• Englishgrammar.org and their newsletter are one of the best ways to keep up-to-date with your grammar, even when you’re out of school.

English writing

• Thewritingsite.org has a blog with various interesting categories put up; from essay, book, to copy writing, all is covered.
• Englishclub.com covers spelling rules, peer editing, and writing prompts. Some good, but quite basic material.
• Grammarcheck.net is an online grammar check site, which is capable of finding various elements of bad writing, including run-on sentences and punctuation mistakes.

Language learning

• Bbc.co.uk has several valuable sections with quizzes, explaining a diverse set of phrases by means of topical background info.
• Languagelearningsoftware.com regularly publishes well-written reviews on language learning programs such as e.g. Rosetta Stone and Rocket Spanish.