A second free application from the Rich Internet Applications suite of programs from the Center for Language Education And Research (CLEAR) of Michigan State University is called Viewpoint. Viewpoint allows you to create simple videos (using your own webcam and microphone) completely from within your web browser. The completed video is saved in your CLEAR account and accessible via a URL or is associated with an "embed code" that you can place on your website, blog or wiki. You can easily add subtitles to your video (see the example below). According to the web site (I haven't tried this yet) you can also upload an existing video from your own computer and it will be converted to a format that can be posted on a website. The Rich Internet Applications support other languages in addition to English so it's useful for foreign language applications as well.
There doesn't seem to be any editing capabilities once the video is made so have a good idea of what you want to say before you start recording! If you do make a mistake or stumble, it's easy to start the recording over.
One quick classroom use is to leave brief messages for students instead of emailing them. Here's my first video message that I posted on my class home page.