I recently happened across a small collection of basic listening material that some of you might find helpful. There is a collection of Japanese Graded Readers called にほんご多読ブックス (not to be confused with the more well-known レベル別日本語多読ライブラリー series of readers). While I strongly recommend these types of books for learners, they are quite expensive. However, it looks like you can download audio of the books completely free! There are several hours of simplified Japanese audio here, so it could be well worth your time to check it out. Of course, this is no substitute for the real product, but it can at least give your listening skills a workout!