Note to self on howto use Google Talk combined with a Google Apps account in an external chat application:
Example: Using pidgin for email mail@domain.org:
Simple Tab
- Protocol: XMPP
- Username: mail (First half of Email address)
- Domain: domain.org (Second half of Email address)
- Resource: gmail.com/
Advanced Tab:
- Connect port: 5222
- Connect server: talk.google.com
- File transfer proxies: proxy.jabber.org
important is the split of your address into username and domain, the resource gmail.com and the connect server talk.google.com