LiveMinutes is a quick and simple solution for web conferencing. You don't need to sign up to use their service. You can easily start a conference by clicking on the "Start Sharing" link and you are provided with a URL that you can share with people. If you feel like it, you can also create an account as well and this allows you to share documents from your computer and have access to other features. At the conclusion of each "meeting" you can get a downloadable report of what was shared and said.
If you feel like it, you can switch to Skype from within the web conference as well. During your web conference you can access Maps, a whiteboard, preview the minutes, and in the future share videos. You could use LiveMinutes to bring in quest speakers or connect with students who are at home sick from all your classes at one time online. It might also be a way to meet with parents who can't make it to your classroom or to parent teacher conferences because of their work schedules.