Wow, I never realized how complicated it was. Of course that's why native speakers are often really bad teachers :) [I sucked when my kids had questions, bc it sounds right isn't helping anyone :)]

Good luck on finding good practice sources. I think the Goetheinstitut has a news for German learners, don't they? And I heard an ad today on NPR for slow German news -- no idea how proficient one has to be though.