If you've used Web conferencing, chances are you've heard of WebEx. The site allows you to share an application--usually a PowerPoint presentation and a whiteboard--on the computer screens of participants across the Internet. The cost savings had better come out of the travel budget, however, because WebEx ain't free: Charges range from 45 cents per minute per person to $200 per user per month.
Centra adds integrated voice-over-IP to standard meeting features at no extra cost. In addition, it integrates with Lotus Notes and Outlook, and your conference's audience needs only to download a slim browser plug-in.
After acquiring PlaceWare in 2003, Microsoft rebranded the Web conferencing service as an alternative to WebEx and tied it in with the Office application suite. The site covers the essentials: shared screens and whiteboards, and live chat. Better pricing than WebEx, integration with Office, and Microsoft's backing make Live Meeting formidable.