Ok,
So In iChat you went to iChat Menu > Preferences > Accounts and use the + Button at the bottom of the list.
In the new Screen you choose GoogleTalk and entered your ID and the password that normally gets you into Google.
From there the Buddy List pops up but soon reports the issue with Name/Password.
If you go to iChat Menu > Preferences > Accounts > (Google Account Highlighted) > Server Settings tab is the Port listed port 5223 ?
I take the server name is talk.google.com as that is reported in your earlier post.
AS you can't login and are Logged ut change the port (which should be black text) to port 443.
The Jabber server at Google accepts logins on port 443
Port 443 is used by Web Browsers on secure site (Such as these Discussions) and as you can post here it must be open in your Router.
Can you now Log in ?
This will tend to prove that ports are not open in your Router.
You will need to sort this out to get other functions of iChat to work properly (Like Video or Audio Chats)
8:42 PM Saturday; September 17, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb( 10.6.8)
Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images." No, Seriously