Sounds like Appia (*my employer*) would be a good fit for you. PC-based, free download, then pay-as-you-go or unlimited use options (paid by the host; guests don't pay to use). Very easy to use. Multiple resolutions up to 720p HD (and the higher resolutions are better for classroom/group settings). Includes desktop sharing, text chat, recording (good for lectures), media streaming (show another video in the conference! Great for training), and audio dial-in/dial-out for attendees who can't be in front of a PC. Also has a one-to-many "broadcast" feature that is great for distance learning. Broadcast saves a bunch of bandwidth, and attendees can text-chat questions to the presenter without needing their own cameras, mics, etc. H.323 interoperability is already in beta. Free online demos can be scheduled at http://www.appiavideo.com/ . Good luck!
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Sounds like Appia (*my employer*) would be a good fit for you. PC-based, free download, then pay-as-you-go or unlimited use options (paid by the host; guests don't pay to use). Very easy to use. Multiple resolutions up to 720p HD (and the higher resolutions are better for classroom/group settings). Includes desktop sharing, text chat, recording (good for lectures), media streaming (show another video in the conference! Great for training), and audio dial-in/dial-out for attendees who can't be in front of a PC. Also has a one-to-many "broadcast" feature that is great for distance learning. Broadcast saves a bunch of bandwidth, and attendees can text-chat questions to the presenter without needing their own cameras, mics, etc. H.323 interoperability is already in beta. Free online demos can be scheduled at http://www.appiavideo.com/ . Good luck!