There are two catches to making use of this fun service. First, everyone who wishes to participate must have the most current version of Skype running. The second catch is that Skype 5.0 beta is only available for Windows right now.
Other changes found in the new upgrade include some of the usual technical stuff, like improved stability and a refreshed user interface. There have also been some tweaks to call quality, including a feature called "automatic call recovery," which automatically reconnects Skype calls interrupted due to network problems.
Related coverage on ZDNet:
- Skype 4.0 released, with full-screen video calling
- Skype won't be developing software for Windows Phone 7
- Skype HD delivers 720p videocalling from PCs or HDTVs
- Skype offering up free calls in over 30 countries for one month