this week the Release Candidate 4 of OpenMeetings has been released. It Includes a new feature called SWFPresentationViewer which allows you to browse into any document you uploaded (pdf, doc, odp, ppt, …) like you are used to in any PDF-Reader.
this is a small ScreenShot:
You also have larger thumbnails of each page of the document in the library. Other new features are the simple dashboard after the login, improvements of the usebility (enabling scrollwheel, password reminder) some new languages (korean, chinese-simplefied, chinese-traditional) path to converter tools ImageMagick and SWFTools can be customized and of course a lot of Bug Fixes and minor updates.
check out the Demo Portal at:
http://code.google.com/p/openmeetings/