There is a new (at least new to me) company called Dimdim that offers a free web conference platform for up to 20 users.
I have previously been using GoToMeeting.com, but will be trying Dimdim moving forward. They also have Pro and Enterperise versions, but for the average small business, I can’t imagine you would often exceed the 20-user limit. From their website:
Dimdim Free. The world’s easiest web conference.
With Dimdim Free, people and organizations around the world can now meet freely. And since everyone will spend less time traveling and more time collaborating, this free product can actually help you make money. Take that, economy!
If you have any user-experience with Dimdim, please share your thoughts below.

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I use Yugma for my FREE web conferencing and the free version also allows you to have up to 20 attendees! The interface is very nice an professional so check it out http://www.yugma.com
Jeff-
Thanks for the Dimdim mention! I’m glad you discovered us. We had a great launch of our latest release — check out the screen sharing, we’ve made a lot of improvements.
Thanks!
-k
Kevin Micalizzi, Community Manager
Dimdim Web Conferencing
e: kevin@dimdim.com
twitter: @dimdim
facebook: dimdim.com/facebook
If you love Dimdim, please vote for us in the Webware 100! http://bit.ly/Vote_for_Dimdim
Hi Jeff,
Have you tried out Mikogo for free web conferencing? This is a free program which is very easy and secure to use for online meetings, web presentations, remote support and more.
Mikogo was developed to make web conferencing free and easy to use for everyone: private users, small businesses, freelancers, etc, and not only large corporations.
The remote support function allows you to assist others over the web via remote keyboard/mouse control, or you can work together on the same document as your meeting participants. Great for real collaboration in real-time.
There are many features included, such as switch presenter, application selection, recording, whiteboard, file transfer, meeting scheduler, back monitor, and more.
Videos, user guide and further info is available on our website: http://www.mikogo.com If you’d like more info, feel free to drop me an email.
Regards,
Andrew Donnelly
The Mikogo Team
I want to suggest you try http://www.showdocument.com – its an alternative tool for dimdim that allows document sharing and web meeting in real-time. all the participants in the session see each others’ drawing, highlights, etc. It is free and requires no installation.
Josh
We almost always need a platform for more than 20 users, so we opted for going with RHUB Web Conferencing (http://rhubcom.com/v4/web_conferencing/home.html) …it’s been perfect for what my company was looking for.