Today Google releases a Beta Instant Messaging and VoIP client called Google Talk. I personally haven't used other VoIP tools like Skype and standard IM clients like MSN Messenger and Yahoo! Chat have taken a backseat for me since I use my web-based home-brewed IM client (equipped with thick tin-foil hat), but I'll probably check this out when I get home tonight...
On a sidenote, this article exemplifies some of the things I hate about marketing-speak. Witness the terms "pull a google" and "google-fy".