Publish a Webpage with Google
You can use a special feature (File > Publish to the Web) to turn any Google Doc into a very basic web page. It's not fancy and is somewhat limited in scope but for basic purposes, I recommend it!
See this web page that is a published Google Doc with directions on how to do this procedure --> http://bitly.com/publishdirections
Note that the real power of this is that you can always go back to your original Google Doc and make changes or edits and those changes are automatically published. The link doesn't change but viewers will see your update within minutes.
Using File > Publish to the web makes your web page publicly accessible but your original Google Doc keeps its privacy settings intact (i.e., only accessible and editable by you unless you make the original available to others through the sharing settings.)
This is great for homework postings, announcements, and other similar situations where you can make routine changes and additions and the students can always refer back to the same web page address. Just remember to keep the layout very basic (avoid columns, text wrapping of images, etc.)