We recently compiled an IBL Blog Playlist. This playlist has some of the main ideas we have shared over the years, compiled on a single page. Blog posts were reactions to needs discovered in our work in the IBL community, and over time it has become hard to find the older posts that are still relevant. We'll keep updating the playlist periodically to keep up with content.
Quick point: If you can do only one thing IBLish, try Think-Pair-Share!