I have discovered a good podcast Tajweed class which was conducted by Imam Zia. Imam Zia go over the basic tajweed rules and examples in audio also provided in the website so that you can listen to the pronunciation and how to read Al-Quran with proper tajweed.

In one of his website also provide a beautiful and informative tajweed course material, which is in colorful PDF formats. It is free of charge. May Allah bless him for amount of effort he put in his work.