Last year I started a class website. I was the one doing all the writing and the only one reading. The website wasn't being utilized. I noticed that class websites rely heavily on students and parents remembering to check back with the website on a regular basis to see if there are any updates throughout the different pages and forum threads. The problem was they didn't know when and what was being updated. This was one of the primary reason why I switched to blogs. Since blogs are arranged in chronological order, what ever is current is on top of the main page. A class blog allows the students to contribute turning it into read an write web instead of just reading what the teacher writes. Blogging gives the students instant publishing to a larger audience. Blogs also can be utilized as "eportfolios, collaborative classwork, online journaling, discussion or problem-based learning or good old social constructivism".
In addition, blogs also give readers the option of subscribing to the website so when it is updated the content is sent to the readers. The two ways you can use subscribe are through RSS and aggregrators or email subscriptions.