Teaching Hacks has an article covering how to use RSS to give out homework assignments. The idea here is to build an RSS feed that allows you to send out to your students the homework. I am intrigued by this idea, but it does seem a bit tech heavy. For K-12 the effort might be worth it, especially if you give out a lot of homework that is more than text. The easier way to do this of course though is just to set up a classblog as I talked about here. If you set up a blog for your classroom the feed will automatically be generated, and any post (say the homework assignment) could be delivered to the students via RSS. That having been said, I think if you have a lot of content rich, frequent assignments, this might be useful.