EuroCom

The EuroCom group has done incredible work on a systematic approach to learning all the Romance, Germanic, and Slavic languages. Most of it is still free online. (They have also begun publishing books to teaching their approach). From what I can tell, Horst Klein, a German scholar in Romance Linguistics is largely responsible for the approach and for the material online for the Romance languages. Most of the learning and explanatory material is in German, although there is some in English at www.eurocomresearch.net. Let's start with the Romance material, since it appears to be the most developed (I haven't seen much for the Germanic languages, and the Slavic Languages appear to need quite some work still). They have put together a website where you can choose to learn to read Spanish, Italian, or Romanian. http://www.kom.tu-darmstadt.de/eurocom/ For each language there are more than 30 short texts, and you can click on the words in the text, and the meanings or the grammar are related to words or languages the learner may already know. There are also translations, quizzes to check comprehension, and numerous accompanying charts on grammar endings, prepositions, verbs, etc. This is an excellent resource for developing guessing skills and for systemizing the Romance roots and the grammar.