Do masters-level courses (similar to that of a MA in Christian Studies). Lots of courses, free registration is required, but that means you can keep track of the lectures you've done! Also includes Lecture Outlines and Transcripts.
The best. Wayne Grudem himself lecturing through his textbook in 117 lectures.
For easier downloading, a podcast of these can be found at:
Aside from the rigours of study, it is also wise to stop, pause, and listen to the word of God preached. The whole reason for studying the Bible is to apply it to our lives. Here are some great places for free sermons.
Analysis and information on World religions, sects, and secular philosophies. Also includes general Christian doctrine and apologetics aiming to help believers answer questions. All analysis is undergirded with the truth of the Bible, and the site contains heaps of clear and concise information