Two really useful sites:
A fun and easy site where you can practice your grammar.
Lingu@net World Wide is a multilingual, online resource centre for foreign language learning. It has tons of information and support for adult learners on how to learn a language.
You can now access the whole site in: Arabic, Basque, Bulgarian, Catalan, Chinese, Czech, Danish, Dutch, English, Estonian, Finnish, French, Galician, German, Greek, Hindi, Hungarian, Icelandic, Irish, Italian, Japanese, Latvian, Lithuanian, Maltese, Polish, Portuguese, Romanian, Russian, Slovak, Slovene, Spanish and Swedish.