Skype currently offers free calls within the US and Canada. I was able to seemlessly install and use it on Fedora Core 5 using the dynamic binary which requires Qt3.2 or greater.
Below is a quick install process:
Download and install the dynamic binary as below:
$ wget http://download.skype.com/linux/skype-1.2.0.18.tar.bz2 # tar -C /opt -xvjf /path/to/skype-1.2.0.18.tar.bz2 # ln -s /opt/skype-1.2.0.18 /opt/skype # ln -s /opt/skype/skype /usr/bin/skype $ cp /opt/skype/skype.desktop ~/Desktop
Once installed, you should be able to click on the desktop launcher icon and run Skype.
Enjoy the free calls!!