To my delight WebHuddle does offer support for OpenOffice.org Impress files to share with the audience.
What type of content may I upload for my meeting?
You may upload any combination of Microsoft Powerpoint files, Open Office Impress files, individual GIF or JPEG images, and ZIP files containing GIF or JPEG images. Note that Powerpoint animations are not visible when displayed in WebHuddle.
WebHuddle is a server centric approach to web conferencing. It server is based on Java servlet technology. The client is a small Java applet of less than 175k. It provides the basic features of sharing presentations, the desktop, files, and interacting with questions to the presenter and questionnaires. Optionally it can add a Voice over IP audio channel. In addition the whole session can be recorded and played back virtually identical.