SkypeTab-ng is a program that adds tabs to Skype™ for Linux (ng stands for next generation).
SkypeTab-ng on Github: https://github.com/kekekeks/skypetab-ng
To install it on Fedora 16-17, just run following command as root
rpm -Uvh "http://widehat.opensuse.org/repositories/home:/keks-n:/skypetab-ng/Fedora_16/noarch/skypetab-ng-0.4.10-23.1.noarch.rpm"
For other instructions (other distro, description), see see here.