Summit French is a blog created by Doug Siegel. It is a homework blog where students can find out what they've missed for the week. It also has links to some excellent language resources.
You may wonder why this is worthy of a post? This is a great example of a simple but effective use of blogging to support learning. Doug posts regularly so that his students know that visiting the blog is worthwhile.
So Doug, here is my advice to you. Build on the excellent foundation that you have and try to get students to really interact with the blog. Encourage them to post comments, give them the opportunity to post and give each other feedback. The potential is unlimited.