As simple as posting a blog, is RSS. Really Simple Syndication is one way in which we can share our thoughts, perspectives, new ideas, links to research, and many more of the granular components of teaching and learning. Automatically (transparently) generated - RSS is simply a description of an update to a blog, podcast, wiki, or almost any Web page. It enables students to receive auto-updates from the instructor. And, not just when they are formally students - they can continue to subscribe, enabling them to continue to receive upates after the end of the semester on into their careers. And, they can feed back into the class of current students.
For more on this concept, see the proceedings of the Distance Teaching and Learning Conference: http://www.uwex.edu/disted/conference/Resource_library/search_detail.cfm?presid=4948. Particularly exciting is that this opens the door to collaborations among students, professionals, and faculty members around the world.