Google Talking

To many users, the Google Talk client might be too simplified and plain, creating a need for applications to spice it up a bit.
GT-Plug is one modification tool that gives you the ability to view graphical emoticons, hide Google Talk with a quick boss key, make the windows see-through, and log all your conversations to your own hard drive.
Extended Talk is one of the most feature-packed modification tools for Google Talk, giving you many of the same abilities as GT-Plug, as well as allowing you to lock the keyboard from Google Talk, change text colors, and talk in 1337 Sp34k.
Extended Talk also features a very complex and rewarding scriptable active status system, letting you display all types of information, even RSS feeds, in your status bar.
Google Talk features a handful of themes by default, and Google has made it quick and easy to create your own themes for the client using nothing but a text editor.
The voice communication feature in Google Talk is a great way to talk freely with other Google Talk users, but it does not allow you to make phone calls to actual phones. However, a number of applications tie into Google Talk to allow you to make such phone calls, at dramatically low rates and with no VAT fees!
Talqer is a small and simple application that allows you to make international VoIP calls directly from your Google Talk...