Following the instructions on the Miranda Community forum I found a post describing how to use Google Talk with Miranda IM.
I have one addition, though: Without SSL Miranda wouldn’t connect on my machine. So installing these two SSL libraries seems to be neccessary.
To make it short:
Options–>Network–>Jabber:
Username:
Password:
Login Server: gmail.com
check the „Manually specify connection host“ and fill in:
Host: talk.google.com
Port: 5223
enable SSL support
… and all should work like a charm.