http://s4pg.us/S4PG (Skype For Power Gamers) is a client-server software package that works with Skype for Windows to provide automated VoIP call and Group Instant Messaging conferencing functionality.
S4PG Client Features :
# Push-to-Talk (PTT) and Mute-Toggle-Key (MTK)
# Instant messaging over Skype (S4PG.Client’s PlayXpert Edition supports AOL Instant Messenger, Google Talk, ICQ, Sony Station Friends, Windows Live Messenger, Yahoo Messenger, and Xfire)
# In-game overlay : First and only complete interfacing and control system for Skype that can be used in full-screen DirectX games.
# Share streaming screenshots of one gamer’s screen to one or more other players.