The new beta version of Skype 2.5 features an option to conference with up to 100 people but there are also a couple of other new features such as easier international dialing, SMS and Outlook integration.
Perhaps the most interesting feature of the version 2.5 beta may be the new Outlook support. Users with Skype's SkypeOut account - the feature that lets Skype users dial out to regular phone numbers - can now view and call their Outlook contacts from within Skype. SkypeOut users will also be able to send out SMS messages to any mobile phone. International callers won't have to remember country codes anymore as the software will automatically enter them when a country is selected on the dropdown menu. The new client will also have integrated payment to buy SkypeOut minutes and ringtones.