Nexus One: Prevent Google Talk from Signing onto your Account When the Device is Turned On
Contributed by Rob Rogers 
Tagged: Android I only use Google Talk periodically, so I have no need for the Talk application to automatically sign onto my account every time that I happen to turn on my phone. Here’s how stop this.
1. Open the Talk application.
2. Select the Menu key.
3. Select More.
4. Select Settings.
5. Uncheck the Automatically sign in checkbox.
Now the account will only be signed into when you launch the Talk application and not when you turn on your phone.
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http://disqus.com/texnogeekz/ said on February 1, 2010
Thank you for this post
Anonymous said on February 1, 2010
More importantly, I wish you could set it to whatever account you want. Right now my main Android account is my Google Apps for Domain account but my chatting is historically done on my gmail account. Unfortunately you can’t set the account used for chat on the android.
Anonymous said on February 1, 2010
You can’t download anything from Android Market if you aren’t logged in on Google Talk!