I am currently researching English learner difficulties for native Spanish speakers. Soon I am taking a Central American Spanish Immersion trip to improve my Spanish speaking and also volunteer teach English in the community.
My colleague, Patricia Hines, recommends a very informative site from Frankfurt International School. It is a guide for English language learners to get advice about language learning specifically related to their L1 (first language). There is also invaluable information for ESL teachers.
On this page, they offer advice to speakers of the following languages: