Wouldn't be nice if you could have multiple instances of gtalk running in the same time?
Well it is possible!
Here's the "secret":
1. Right click on your gtalk shortcut and select Properties.
2. On the "Target" textfield you'll find something like "[PATH-TO-APPDATA]\Roaming\Google\Google Talk\googletalk.exe" /startmenu" replace "startmenu" with "nomutex". (http://ionutstan.ro/jing/2011-08-06_1512.png)
3. Open as many gtalk instances as you want.